diff --git a/.env b/.env
index 76a1d6d..d4136a1 100644
--- a/.env
+++ b/.env
@@ -19,6 +19,11 @@ client_id = 616562
 client_secret = CfMDrllyqBTFKrUkO2XaE7OmWTYqP3yd
 hmac = 8aU8WnITYhwaGTXH
 
+[promotion]
+PROMOTION_LLM_URL=http://chat.taimed.cn/v1/chat/completions
+PROMOTION_LLM_MODEL=your-model-name
+PROMOTION_LLM_TIMEOUT=30
+PROMOTION_LLM_FALLBACK=""
 
 [journal]
 ;官网服务器地址
diff --git a/application/api/controller/ExpertFinder.php b/application/api/controller/ExpertFinder.php
index 65f1c08..463c0ab 100644
--- a/application/api/controller/ExpertFinder.php
+++ b/application/api/controller/ExpertFinder.php
@@ -91,8 +91,8 @@ class ExpertFinder extends Base
     public function batchFillCountry(){
         $service = new ExpertFinderService();
 
-        $chain1 = $service->enqueueNextCountryFill(0, 'FetchExpertCity', '');
-        $chain2 = $service->enqueueNextCountryFill(0, 'FetchExpertCity1', 'http://125.39.141.154:10002/v1/chat/completions');
+//        $chain1 = $service->enqueueNextCountryFill(0, 'FetchExpertCity', '');
+        $chain2 = $service->enqueueNextCountryFill(0, 'FetchExpertCityOne', 'http://125.39.141.154:10002/v1/chat/completions');
 
         $pending = Db::name('expert')
             ->where('affiliation', '<>', '')
@@ -101,7 +101,7 @@ class ExpertFinder extends Base
             ->count();
 
         return jsonSuccess([
-            'chain1_started' => $chain1,
+//            'chain1_started' => $chain1,
             'chain2_started' => $chain2,
             'pending' => $pending,
         ]);
diff --git a/application/api/job/PromotionPrepare.php b/application/api/job/PromotionPrepare.php
index 6fc4424..13791ef 100644
--- a/application/api/job/PromotionPrepare.php
+++ b/application/api/job/PromotionPrepare.php
@@ -6,10 +6,12 @@ use think\queue\Job;
 use app\common\PromotionService;
 
 /**
- * 队列任务：对单个 promotion_task 执行 prepareTask（预生成 subject/body）。
+ * 【已废弃 / 兼容保留】
  *
- * 队列名：promotion
- * 启动 worker：php think queue:listen --queue promotion
+ * 旧版 task 级 prepare Job；新逻辑请使用 PromotionPrepareTask + PromotionPrepareEmail。
+ *
+ * 本类仅为兼容队列中可能遗留的旧 payload：接收到旧 job 时转发到新的调度器，
+ * 保证旧消息不会丢失。新代码不应再 push 此 Job。
  */
 class PromotionPrepare
 {
@@ -18,18 +20,13 @@ class PromotionPrepare
         $taskId  = intval(isset($data['task_id']) ? $data['task_id'] : 0);
         $service = new PromotionService();
 
-        if (!$taskId) {
-            $job->delete();
-            return;
-        }
-
-        try {
-            $result = $service->prepareTask($taskId);
-            $service->log('[PromotionPrepare] task=' . $taskId
-                . ' prepared=' . $result['prepared']
-                . ' failed=' . $result['failed']);
-        } catch (\Exception $e) {
-            $service->log('[PromotionPrepare] task=' . $taskId . ' exception=' . $e->getMessage());
+        if ($taskId > 0) {
+            try {
+                $service->enqueuePrepareTask($taskId);
+                $service->log('[PromotionPrepare][deprecated] forwarded task=' . $taskId . ' -> PromotionPrepareTask');
+            } catch (\Exception $e) {
+                $service->log('[PromotionPrepare][deprecated] task=' . $taskId . ' forward_exception=' . $e->getMessage());
+            }
         }
 
         $job->delete();
diff --git a/application/api/job/PromotionPrepareEmail.php b/application/api/job/PromotionPrepareEmail.php
new file mode 100644
index 0000000..793e8c3
--- /dev/null
+++ b/application/api/job/PromotionPrepareEmail.php
@@ -0,0 +1,52 @@
+<?php
+
+namespace app\api\job;
+
+use think\queue\Job;
+use app\common\PromotionService;
+
+/**
+ * 队列任务：单封邮件 prepare（调用 LLM 生成个性化描述 + 渲染模板 + 写入 log）。
+ *
+ * 单个 Job 可能耗时较长（LLM 调用 30s 超时），因此使用独立队列 promotion_email，
+ * 多 worker 并行消费即可提升吞吐。
+ *
+ * 失败策略：
+ *   - PromotionService::prepareSingleEmail 内部已做兜底（LLM 失败回退到配置文案），
+ *     这里遇到未捕获异常时允许重试一次，超过 3 次直接 delete 避免无限循环。
+ *
+ * 队列名：promotion_email
+ * 启动 worker：php think queue:listen --queue promotion_email
+ */
+class PromotionPrepareEmail
+{
+    public function fire(Job $job, $data)
+    {
+        $logId   = intval(isset($data['log_id']) ? $data['log_id'] : 0);
+        $service = new PromotionService();
+
+        if (!$logId) {
+            $job->delete();
+            return;
+        }
+
+        try {
+            $result = $service->prepareSingleEmail($logId);
+            $service->log('[PromotionPrepareEmail] log=' . $logId
+                . ' code=' . $result['code']
+                . ' llm_status=' . $result['llm_status']
+                . ' msg=' . $result['msg']);
+            $job->delete();
+        } catch (\Exception $e) {
+            $service->log('[PromotionPrepareEmail] log=' . $logId
+                . ' attempts=' . $job->attempts()
+                . ' exception=' . $e->getMessage());
+
+            if ($job->attempts() >= 3) {
+                $job->delete();
+            } else {
+                $job->release(30);
+            }
+        }
+    }
+}
diff --git a/application/api/job/PromotionPrepareTask.php b/application/api/job/PromotionPrepareTask.php
new file mode 100644
index 0000000..a0cf2dd
--- /dev/null
+++ b/application/api/job/PromotionPrepareTask.php
@@ -0,0 +1,42 @@
+<?php
+
+namespace app\api\job;
+
+use think\queue\Job;
+use app\common\PromotionService;
+
+/**
+ * 队列任务：task 级别的 prepare 调度器。
+ *
+ * 职责：遍历 task 下待准备的 promotion_email_log，
+ *       将每封邮件拆成一条 PromotionPrepareEmail 推到 promotion_email 队列，
+ *       以便并行调用 LLM 生成个性化描述。
+ *
+ * 队列名：promotion
+ * 启动 worker：php think queue:listen --queue promotion
+ */
+class PromotionPrepareTask
+{
+    public function fire(Job $job, $data)
+    {
+        $taskId  = intval(isset($data['task_id']) ? $data['task_id'] : 0);
+        $service = new PromotionService();
+
+        if (!$taskId) {
+            $job->delete();
+            return;
+        }
+
+        try {
+            $result = $service->dispatchPrepareEmails($taskId);
+            $service->log('[PromotionPrepareTask] task=' . $taskId
+                . ' dispatched=' . $result['dispatched']
+                . ' already_done=' . ($result['already_done'] ? 1 : 0)
+                . (empty($result['error']) ? '' : ' error=' . $result['error']));
+        } catch (\Exception $e) {
+            $service->log('[PromotionPrepareTask] task=' . $taskId . ' exception=' . $e->getMessage());
+        }
+
+        $job->delete();
+    }
+}
diff --git a/application/common/PromotionLlmService.php b/application/common/PromotionLlmService.php
new file mode 100644
index 0000000..24345c0
--- /dev/null
+++ b/application/common/PromotionLlmService.php
@@ -0,0 +1,176 @@
+<?php
+
+namespace app\common;
+
+use think\Env;
+
+/**
+ * 推广邮件 LLM 服务
+ *
+ * 作用：基于 expert 的代表作 (paper_title) + 期刊信息 (name / scope 等)，
+ * 生成一段 2-3 句的个性化描述，用于邮件模板变量 {{llm_description}}。
+ *
+ * 配置（.env 的 [promotion] 段）：
+ *   PROMOTION_LLM_URL      chat/completions 接口地址
+ *   PROMOTION_LLM_MODEL    模型名
+ *   PROMOTION_LLM_TIMEOUT  超时时间(秒)，默认 30
+ *   PROMOTION_LLM_FALLBACK 兜底描述（LLM 不可用 / 调用失败时使用）
+ *
+ * 返回约定：
+ *   ['status' => 1|2|3, 'text' => string]
+ *     1 = LLM 成功生成
+ *     2 = LLM 调用失败，text = 兜底文案
+ *     3 = 跳过（缺少代表作等前置条件），text = 兜底文案
+ */
+class PromotionLlmService
+{
+    private $url;
+    private $model;
+    private $timeout;
+    private $apiKey;
+    private $fallback;
+
+    public function __construct()
+    {
+        $this->url      = trim((string)Env::get('promotion.promotion_llm_url', ''));
+        $this->model    = trim((string)Env::get('promotion.promotion_llm_model', ''));
+        $this->timeout  = max(5, intval(Env::get('promotion.promotion_llm_timeout', 30)));
+        $this->apiKey   = trim((string)Env::get('promotion.promotion_llm_api_key', ''));
+        $this->fallback = trim((string)Env::get('promotion.promotion_llm_fallback',
+            'Your recent work aligns closely with the scope of our journal, and we would be honored to consider a contribution from you.'));
+    }
+
+    /**
+     * 生成个性化描述
+     *
+     * @param array $expert  至少包含 name / representative_work_title / fields / affiliation
+     * @param array $journal 至少包含 title (name) / aims (可选) / databases (可选)
+     * @return array ['status' => 1|2|3, 'text' => string]
+     */
+    public function generateDescription(array $expert, array $journal): array
+    {
+        $paperTitle  = trim((string)($expert['representative_work_title'] ?? ''));
+        $expertName  = trim((string)($expert['name'] ?? ''));
+        $journalName = trim((string)($journal['title'] ?? ''));
+
+        if ($paperTitle === '' || $journalName === '') {
+            return ['status' => 3, 'text' => $this->fallback];
+        }
+
+        if ($this->url === '' || $this->model === '') {
+            return ['status' => 2, 'text' => $this->fallback];
+        }
+
+        $expertField = trim((string)($expert['fields'] ?? ($expert['field'] ?? '')));
+        $journalAims = trim((string)($journal['aims'] ?? ''));
+        $journalDbs  = trim((string)($journal['databases'] ?? ''));
+
+        $system = 'You are an academic editorial assistant. '
+            . 'Write a short, warm, professional English paragraph (2-3 sentences, <=50 words) '
+            . 'that: (1) briefly appreciates the author\'s recent paper, '
+            . '(2) explains why it fits the journal\'s scope, '
+            . '(3) gently invites a future submission. '
+            . 'Do NOT use placeholders, do NOT add greetings, do NOT add signatures, '
+            . 'output plain text only (no markdown).';
+
+        $userLines = [];
+        $userLines[] = 'Author name: ' . ($expertName !== '' ? $expertName : '(unknown)');
+        if ($expertField !== '') {
+            $userLines[] = 'Author research field: ' . $expertField;
+        }
+        $userLines[] = 'Recent paper title: ' . $paperTitle;
+        $userLines[] = 'Target journal: ' . $journalName;
+        if ($journalAims !== '') {
+            $userLines[] = 'Journal aims & scope: ' . mb_substr($journalAims, 0, 500);
+        }
+        if ($journalDbs !== '') {
+            $userLines[] = 'Journal indexing: ' . mb_substr($journalDbs, 0, 200);
+        }
+        $userLines[] = 'Return only the paragraph, nothing else.';
+        $user = implode("\n", $userLines);
+
+        $payload = [
+            'model'       => $this->model,
+            'temperature' => 0.4,
+            'messages'    => [
+                ['role' => 'system', 'content' => $system],
+                ['role' => 'user',   'content' => $user],
+            ],
+        ];
+
+        $content = $this->postChat($payload);
+        if ($content === null) {
+            return ['status' => 2, 'text' => $this->fallback];
+        }
+
+        $content = $this->cleanContent($content);
+        if ($content === '') {
+            return ['status' => 2, 'text' => $this->fallback];
+        }
+
+        return ['status' => 1, 'text' => $content];
+    }
+
+    /**
+     * 调用 chat/completions 接口，返回 content 字符串；失败返回 null。
+     */
+    private function postChat(array $payload)
+    {
+        $ch = curl_init();
+        curl_setopt($ch, CURLOPT_URL, $this->url);
+        curl_setopt($ch, CURLOPT_POST, true);
+        curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($payload, JSON_UNESCAPED_UNICODE));
+        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
+        curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, min(10, $this->timeout));
+        curl_setopt($ch, CURLOPT_TIMEOUT, $this->timeout);
+
+        $headers = ['Content-Type: application/json'];
+        if ($this->apiKey !== '') {
+            $headers[] = 'Authorization: Bearer ' . $this->apiKey;
+        }
+        curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
+
+        $raw = curl_exec($ch);
+        if ($raw === false) {
+            curl_close($ch);
+            return null;
+        }
+        $httpCode = intval(curl_getinfo($ch, CURLINFO_HTTP_CODE));
+        curl_close($ch);
+        if ($httpCode < 200 || $httpCode >= 300) {
+            return null;
+        }
+
+        $data = json_decode($raw, true);
+        if (!is_array($data)) return null;
+
+        if (isset($data['choices'][0]['message']['content'])) {
+            return (string)$data['choices'][0]['message']['content'];
+        }
+        if (isset($data['content'])) {
+            return (string)$data['content'];
+        }
+        return null;
+    }
+
+    /**
+     * 清洗 LLM 输出：去除 markdown 包裹、多余空白、首尾引号、过长截断。
+     */
+    private function cleanContent(string $text): string
+    {
+        $text = trim($text);
+        $text = preg_replace('/^```[a-zA-Z]*\s*|```$/m', '', $text);
+        $text = trim($text);
+        $text = trim($text, "\"' \t\n\r\0\x0B");
+        $text = preg_replace('/\s+/', ' ', $text);
+        if (mb_strlen($text) > 800) {
+            $text = mb_substr($text, 0, 800);
+        }
+        return trim($text);
+    }
+
+    public function getFallback(): string
+    {
+        return $this->fallback;
+    }
+}
diff --git a/application/common/PromotionService.php b/application/common/PromotionService.php
index 5f04c70..f86d00e 100644
--- a/application/common/PromotionService.php
+++ b/application/common/PromotionService.php
@@ -93,20 +93,36 @@ class PromotionService
             $expert_fields = Db::name('expert_field')
                 ->where('expert_id', $expert['expert_id'])
                 ->where('state', 0)
+                ->order('expert_field_id desc')
                 ->select();
+
+            $taskFields = $this->resolveTaskFields($task);
+            $taskFieldLower = [];
+            foreach ($taskFields as $tf) {
+                $tf = strtolower(trim($tf));
+                if ($tf !== '') $taskFieldLower[$tf] = true;
+            }
+
             $fieldSet = [];
-            $representativeTitle = '';
+            $matchedTitle  = '';
+            $fallbackTitle = '';
             foreach ($expert_fields as $ef) {
                 $fn = trim($ef['field']);
                 if ($fn !== '' && !in_array($fn, $fieldSet)) {
                     $fieldSet[] = $fn;
                 }
-                if ($representativeTitle === '' && !empty($ef['paper_title'])) {
-                    $representativeTitle = trim($ef['paper_title']);
+                $paper = trim((string)($ef['paper_title'] ?? ''));
+                if ($paper === '') continue;
+                if ($matchedTitle === '' && $fn !== '' && isset($taskFieldLower[strtolower($fn)])) {
+                    $matchedTitle = $paper;
                 }
+                if ($fallbackTitle === '') {
+                    $fallbackTitle = $paper;
+                }
+                if ($matchedTitle !== '' && $fallbackTitle !== '') break;
             }
             $expert['fields'] = implode(',', $fieldSet);
-            $expert['representative_work_title'] = $representativeTitle;
+            $expert['representative_work_title'] = $matchedTitle !== '' ? $matchedTitle : $fallbackTitle;
             $expertVars  = $this->buildExpertVars($expert);
             $journalVars = $this->buildJournalVars($journal);
             $vars        = array_merge($journalVars, $expertVars);
@@ -174,7 +190,254 @@ class PromotionService
     // ==================== 准备与触发（今日准备、明日发送） ====================
 
     /**
-     * 为指定任务预生成所有待发邮件的 subject/body，写入 log；完成后将任务置为 state=5（已准备）
+     * 调度：为指定任务的所有待准备邮件分发 PromotionPrepareEmail 队列任务。
+     *
+     * 每封邮件单独一条 job，可在 promotion_email 队列中并行消费（调用 LLM 生成个性化描述）。
+     * 所有邮件准备完成后，由最后一条 PromotionPrepareEmail 在 finalize 阶段将任务置为 state=5。
+     *
+     * @param int $taskId
+     * @return array ['dispatched' => int, 'already_done' => bool, 'error' => string|null]
+     */
+    public function dispatchPrepareEmails($taskId)
+    {
+        $task = Db::name('promotion_task')->where('task_id', $taskId)->find();
+        if (!$task) {
+            return ['dispatched' => 0, 'already_done' => false, 'error' => 'task_not_found'];
+        }
+        if ($task['state'] != 0) {
+            return ['dispatched' => 0, 'already_done' => $task['state'] == 5, 'error' => 'task_state_not_draft'];
+        }
+
+        $logIds = Db::name('promotion_email_log')
+            ->where('task_id', $taskId)
+            ->where('state', 0)
+            ->where('prepared_at', 0)
+            ->order('log_id asc')
+            ->column('log_id');
+
+        if (empty($logIds)) {
+            // 没有需要准备的邮件，直接置为已准备
+            Db::name('promotion_task')->where('task_id', $taskId)->update([
+                'state' => 5,
+                'utime' => time(),
+            ]);
+            $this->log("dispatchPrepareEmails task_id={$taskId} no_logs -> state=5");
+            return ['dispatched' => 0, 'already_done' => true, 'error' => null];
+        }
+
+        foreach ($logIds as $logId) {
+            $this->enqueuePrepareEmail(intval($logId));
+        }
+
+        $this->log("dispatchPrepareEmails task_id={$taskId} dispatched=" . count($logIds));
+        return ['dispatched' => count($logIds), 'already_done' => false, 'error' => null];
+    }
+
+    /**
+     * 对单封邮件执行准备：拉取 expert / journal，调 LLM 生成描述，渲染模板，写回 log。
+     *
+     * 由 PromotionPrepareEmail Job 调用；也可手工调用做调试。
+     *
+     * @param int $logId
+     * @return array ['code' => 0|1, 'msg' => string, 'llm_status' => int]
+     */
+    public function prepareSingleEmail($logId)
+    {
+        $log = Db::name('promotion_email_log')->where('log_id', $logId)->find();
+        if (!$log) {
+            return ['code' => 1, 'msg' => 'log_not_found', 'llm_status' => 0];
+        }
+        if ($log['state'] != 0) {
+            return ['code' => 1, 'msg' => 'log_state_not_pending', 'llm_status' => 0];
+        }
+        if (!empty($log['prepared_at'])) {
+            return ['code' => 0, 'msg' => 'already_prepared', 'llm_status' => intval($log['llm_status'] ?? 0)];
+        }
+
+        $task = Db::name('promotion_task')->where('task_id', $log['task_id'])->find();
+        if (!$task) {
+            Db::name('promotion_email_log')->where('log_id', $logId)->update([
+                'state'     => 2,
+                'error_msg' => 'Task not found',
+                'send_time' => time(),
+            ]);
+            return ['code' => 1, 'msg' => 'task_not_found', 'llm_status' => 0];
+        }
+
+        $expert = Db::name('expert')->where('expert_id', $log['expert_id'])->find();
+        if (!$expert) {
+            Db::name('promotion_email_log')->where('log_id', $logId)->update([
+                'state'     => 2,
+                'error_msg' => 'Expert not found',
+                'send_time' => time(),
+            ]);
+            $this->tryFinalizeTask($task['task_id']);
+            return ['code' => 1, 'msg' => 'expert_not_found', 'llm_status' => 0];
+        }
+
+        $expert_fields = Db::name('expert_field')
+            ->where('expert_id', $expert['expert_id'])
+            ->where('state', 0)
+            ->order('expert_field_id desc')
+            ->select();
+
+        // 领域优先级：任务所属工厂/期刊的目标领域
+        $taskFields = $this->resolveTaskFields($task);
+        $taskFieldLower = [];
+        foreach ($taskFields as $tf) {
+            $tf = strtolower(trim($tf));
+            if ($tf !== '') $taskFieldLower[$tf] = true;
+        }
+
+        $fieldSet = [];
+        $matchedTitle  = '';
+        $fallbackTitle = '';
+        foreach ($expert_fields as $ef) {
+            $fn = trim($ef['field']);
+            if ($fn !== '' && !in_array($fn, $fieldSet)) {
+                $fieldSet[] = $fn;
+            }
+            $paper = trim((string)($ef['paper_title'] ?? ''));
+            if ($paper === '') continue;
+
+            // 匹配到任务领域的 paper 优先（按最新 expert_field_id desc 顺序取第一条）
+            if ($matchedTitle === '' && $fn !== '' && isset($taskFieldLower[strtolower($fn)])) {
+                $matchedTitle = $paper;
+            }
+            if ($fallbackTitle === '') {
+                $fallbackTitle = $paper;
+            }
+            if ($matchedTitle !== '' && $fallbackTitle !== '') break;
+        }
+        $expert['fields'] = implode(',', $fieldSet);
+        $expert['representative_work_title'] = $matchedTitle !== '' ? $matchedTitle : $fallbackTitle;
+
+        $journal = Db::name('journal')->where('journal_id', $task['journal_id'])->find();
+
+        // 调用 LLM 生成个性化描述（失败/缺条件时回退到兜底文案）
+        $llmResult = ['status' => 0, 'text' => ''];
+        try {
+            $llm = new PromotionLlmService();
+            $llmResult = $llm->generateDescription($expert, $journal ?: []);
+        } catch (\Exception $e) {
+            $llmResult = ['status' => 2, 'text' => ''];
+            $this->log("prepareSingleEmail log_id={$logId} llm_exception=" . $e->getMessage());
+        }
+        $llmText   = (string)$llmResult['text'];
+        $llmStatus = intval($llmResult['status']);
+
+        $expert['llm_description'] = $llmText;
+
+        $expertVars  = $this->buildExpertVars($expert);
+        $journalVars = $this->buildJournalVars($journal);
+        $vars        = array_merge($journalVars, $expertVars);
+        $rendered    = $this->renderFromTemplate(
+            $task['template_id'],
+            $task['journal_id'],
+            json_encode($vars, JSON_UNESCAPED_UNICODE),
+            $task['style_id']
+        );
+
+        $now = time();
+        if ($rendered['code'] !== 0) {
+            Db::name('promotion_email_log')->where('log_id', $logId)->update([
+                'state'           => 2,
+                'error_msg'       => 'Prepare failed: ' . $rendered['msg'],
+                'llm_description' => mb_substr($llmText, 0, 2000),
+                'llm_status'      => $llmStatus,
+                'send_time'       => $now,
+            ]);
+            $this->tryFinalizeTask($task['task_id']);
+            return ['code' => 1, 'msg' => $rendered['msg'], 'llm_status' => $llmStatus];
+        }
+
+        Db::name('promotion_email_log')->where('log_id', $logId)->update([
+            'subject_prepared' => mb_substr($rendered['data']['subject'], 0, 512),
+            'body_prepared'    => $rendered['data']['body'],
+            'llm_description'  => mb_substr($llmText, 0, 2000),
+            'llm_status'       => $llmStatus,
+            'prepared_at'      => $now,
+        ]);
+
+        $this->tryFinalizeTask($task['task_id']);
+
+        return ['code' => 0, 'msg' => 'ok', 'llm_status' => $llmStatus];
+    }
+
+    /**
+     * 解析 task 的目标领域名称列表。
+     *
+     * 优先级：
+     *   1. task.factory_id > 0：读取对应 promotion_factory.fetch_ids，联 t_expert_fetch 取 field
+     *   2. 否则（手工任务）：走 journal_promotion_field → t_expert_fetch 取 field
+     *
+     * 返回空数组表示没有限定领域。
+     */
+    public function resolveTaskFields($task)
+    {
+        if (!is_array($task)) return [];
+
+        $factoryId = intval($task['factory_id'] ?? 0);
+        if ($factoryId > 0) {
+            $factory = Db::name('promotion_factory')
+                ->where('promotion_factory_id', $factoryId)
+                ->find();
+            if ($factory && !empty($factory['fetch_ids'])) {
+                $ids = array_filter(array_map('intval', explode(',', $factory['fetch_ids'])));
+                if (!empty($ids)) {
+                    $fields = Db::name('expert_fetch')
+                        ->where('expert_fetch_id', 'in', $ids)
+                        ->where('state', 0)
+                        ->column('field');
+                    return array_values(array_unique(array_filter(array_map('trim', $fields))));
+                }
+            }
+            return [];
+        }
+
+        // 手工任务走期刊的推广领域绑定
+        $journalId = intval($task['journal_id'] ?? 0);
+        if ($journalId <= 0) return [];
+        $fields = Db::name('journal_promotion_field')
+            ->alias('jpf')
+            ->join('t_expert_fetch ef_fetch', 'ef_fetch.expert_fetch_id = jpf.expert_fetch_id', 'inner')
+            ->where('jpf.journal_id', $journalId)
+            ->where('jpf.state', 0)
+            ->where('ef_fetch.state', 0)
+            ->column('ef_fetch.field');
+        return array_values(array_unique(array_filter(array_map('trim', $fields))));
+    }
+
+    /**
+     * 检查 task 下还有无未准备的 log，若全部完成则将 task 置为 state=5（已准备）。
+     */
+    public function tryFinalizeTask($taskId)
+    {
+        $taskId = intval($taskId);
+        if ($taskId <= 0) return;
+
+        $task = Db::name('promotion_task')->where('task_id', $taskId)->find();
+        if (!$task || $task['state'] != 0) return;
+
+        $remaining = Db::name('promotion_email_log')
+            ->where('task_id', $taskId)
+            ->where('state', 0)
+            ->where('prepared_at', 0)
+            ->count();
+
+        if ($remaining == 0) {
+            Db::name('promotion_task')->where('task_id', $taskId)->update([
+                'state' => 5,
+                'utime' => time(),
+            ]);
+            $this->log("tryFinalizeTask task_id={$taskId} -> state=5");
+        }
+    }
+
+    /**
+     * 兼容旧接口：同步为 task 内所有邮件执行准备（不建议在 HTTP 请求中直接调用，
+     * 大邮件量场景请走 dispatchPrepareEmails）。
+     *
      * @param int $taskId
      * @return array ['prepared' => int, 'failed' => int, 'error' => string|null]
      */
@@ -188,80 +451,28 @@ class PromotionService
             return ['prepared' => 0, 'failed' => 0, 'error' => 'task_state_not_draft'];
         }
 
-        $journal = Db::name('journal')->where('journal_id', $task['journal_id'])->find();
-        $logs = Db::name('promotion_email_log')
+        $logIds = Db::name('promotion_email_log')
             ->where('task_id', $taskId)
             ->where('state', 0)
             ->where('prepared_at', 0)
             ->order('log_id asc')
-            ->select();
+            ->column('log_id');
 
         $prepared = 0;
         $failed   = 0;
-        $now      = time();
-
-        $journalVars = $this->buildJournalVars($journal);
-        foreach ($logs as $log) {
-            $expert = Db::name('expert')->where('expert_id', $log['expert_id'])->find();
-            if (!$expert) {
-                Db::name('promotion_email_log')->where('log_id', $log['log_id'])->update([
-                    'state' => 2,
-                    'error_msg' => 'Expert not found',
-                    'send_time' => $now,
-                ]);
+        foreach ($logIds as $logId) {
+            $r = $this->prepareSingleEmail(intval($logId));
+            if ($r['code'] === 0) {
+                $prepared++;
+            } else {
                 $failed++;
-                continue;
             }
-
-            $expert_fields = Db::name('expert_field')
-                ->where('expert_id', $expert['expert_id'])
-                ->where('state', 0)
-                ->select();
-
-            $fieldSet = [];
-            $representativeTitle = '';
-            foreach ($expert_fields as $ef) {
-                $fn = trim($ef['field']);
-                if ($fn !== '' && !in_array($fn, $fieldSet)) {
-                    $fieldSet[] = $fn;
-                }
-                if ($representativeTitle === '' && !empty($ef['paper_title'])) {
-                    $representativeTitle = trim($ef['paper_title']);
-                }
-            }
-            $expert['fields'] = implode(',', $fieldSet);
-            $expert['representative_work_title'] = $representativeTitle;
-
-            $expertVars  = $this->buildExpertVars($expert);
-            $vars        = array_merge($journalVars, $expertVars);
-            $rendered    = $this->renderFromTemplate(
-                $task['template_id'],
-                $task['journal_id'],
-                json_encode($vars, JSON_UNESCAPED_UNICODE),
-                $task['style_id']
-            );
-
-            if ($rendered['code'] !== 0) {
-                Db::name('promotion_email_log')->where('log_id', $log['log_id'])->update([
-                    'state'     => 2,
-                    'error_msg' => 'Prepare failed: ' . $rendered['msg'],
-                    'send_time' => $now,
-                ]);
-                $failed++;
-                continue;
-            }
-
-            Db::name('promotion_email_log')->where('log_id', $log['log_id'])->update([
-                'subject_prepared' => mb_substr($rendered['data']['subject'], 0, 512),
-                'body_prepared'    => $rendered['data']['body'],
-                'prepared_at'      => $now,
-            ]);
-            $prepared++;
         }
 
-        Db::name('promotion_task')->where('task_id', $taskId)->update([
+        // 兜底：即使 tryFinalizeTask 已触发，这里再保证 state 置为 5
+        Db::name('promotion_task')->where('task_id', $taskId)->where('state', 0)->update([
             'state' => 5,
-            'utime' => $now,
+            'utime' => time(),
         ]);
         $this->log("prepareTask task_id={$taskId} prepared={$prepared} failed={$failed}");
 
@@ -297,17 +508,38 @@ class PromotionService
     }
 
     /**
-     * 将单个 task 的 prepare 推入队列异步执行
+     * 将单个 task 的 prepare 推入队列异步执行（调度层）。
+     *
+     * 调度 Job 会进一步把每封邮件拆分成 PromotionPrepareEmail 推到 promotion_email 队列，
+     * 以便并行调用 LLM 生成个性化描述。
      */
     public function enqueuePrepareTask($taskId, $delay = 0)
     {
-        $jobClass = 'app\api\job\PromotionPrepare@fire';
+        $jobClass = 'app\api\job\PromotionPrepareTask@fire';
         $data     = ['task_id' => intval($taskId)];
 
         if ($delay > 0) {
-            Queue::later($delay, $jobClass, $data, 'promotion');
+            Queue::later($delay, $jobClass, $data, 'promotionSend');
         } else {
-            Queue::push($jobClass, $data, 'promotion');
+            Queue::push($jobClass, $data, 'promotionSend');
+        }
+    }
+
+    /**
+     * 将单封邮件的 prepare 推入队列异步执行（LLM 层）。
+     *
+     * 队列名：promotion_email
+     * 启动 worker：php think queue:listen --queue promotion_email
+     */
+    public function enqueuePrepareEmail($logId, $delay = 0)
+    {
+        $jobClass = 'app\api\job\PromotionPrepareEmail@fire';
+        $data     = ['log_id' => intval($logId)];
+
+        if ($delay > 0) {
+            Queue::later($delay, $jobClass, $data, 'promotion_email');
+        } else {
+            Queue::push($jobClass, $data, 'promotion_email');
         }
     }
 
@@ -491,6 +723,7 @@ class PromotionService
 
     public function buildExpertVars($expert)
     {
+        $llm = $expert['llm_description'] ?? '';
         return [
             'expert_title'       => "Ph.D",
             'expert_name'        => $expert['name'] ?? '',
@@ -498,6 +731,8 @@ class PromotionService
             'expert_affiliation' => $expert['affiliation'] ?? '',
             'expert_field'       => $expert['fields'] ?? ($expert['field'] ?? ''),
             'representative_work_title' => $expert['representative_work_title'] ?? '',
+            'llm_description'    => $llm,
+            'ai_content_analysis' => $llm,
         ];
     }
 
diff --git a/sql/add_llm_fields_to_promotion_email_log.sql b/sql/add_llm_fields_to_promotion_email_log.sql
new file mode 100644
index 0000000..09e9107
--- /dev/null
+++ b/sql/add_llm_fields_to_promotion_email_log.sql
@@ -0,0 +1,7 @@
+-- 为 t_promotion_email_log 增加 LLM 生成字段
+-- llm_description: 大模型生成的个性化描述（用于模板变量 {{llm_description}}）
+-- llm_status:      0=未处理 1=成功 2=失败已回退兜底 3=跳过(缺代表作)
+
+ALTER TABLE `t_promotion_email_log`
+  ADD COLUMN `llm_description` TEXT NULL COMMENT '大模型生成的个性化描述' AFTER `body_prepared`,
+  ADD COLUMN `llm_status` TINYINT NOT NULL DEFAULT 0 COMMENT 'LLM 处理状态: 0未处理 1成功 2失败兜底 3跳过' AFTER `llm_description`;