diff --git a/application/api/job/UserFieldAiFill.php b/application/api/job/UserFieldAiFill.php
index deb1b447..acb0dcd6 100644
--- a/application/api/job/UserFieldAiFill.php
+++ b/application/api/job/UserFieldAiFill.php
@@ -30,6 +30,6 @@ class UserFieldAiFill
         $job->delete();
 
         $delay = max(0, (int) (isset($data['delay']) ? $data['delay'] : 1));
-//        $svc->enqueueNextFieldAi($delay, $queue, $userId, $force);
+        $svc->enqueueNextFieldAi($delay, $queue, $userId, $force);
     }
 }
diff --git a/application/common/PromotionService.php b/application/common/PromotionService.php
index d958bed2..c5b1ad2e 100644
--- a/application/common/PromotionService.php
+++ b/application/common/PromotionService.php
@@ -509,47 +509,66 @@ class PromotionService
                 }
             }
 
-            // 一次 LLM 调用生成两段内容（description + advised_topics）
-            $llmResult = [
-                'description'           => '',
-                'description_status'    => 0,
-                'advised_topics'        => '',
-                'advised_topics_status' => 0,
-            ];
-            try {
-                $llm = new PromotionLlmService();
-                $llmResult = $llm->generateEmailContent(
-                    $expert,
-                    $journal ?: [],
-                    $overlapFields,
-                    $taskFields,
-                    $fieldSet
-                );
-            } catch (\Exception $e) {
-                $fbDesc = '';
-                $fbAdvised = '';
-                try {
-                    $fbSvc = isset($llm) ? $llm : new PromotionLlmService();
-                    $fbDesc = $fbSvc->getFallback();
-                    $fbAdvised = $fbSvc->getAdvisedFallback();
-                } catch (\Exception $ignore) {
-                }
-                $llmResult = [
-                    'description'           => $fbDesc,
-                    'description_status'    => 2,
-                    'advised_topics'        => $fbAdvised,
-                    'advised_topics_status' => 2,
-                ];
-                $this->log("prepareSingleEmail log_id={$logId} llm_exception=" . $e->getMessage());
-            }
-            $llmText       = (string)$llmResult['description'];
-            $llmStatus     = intval($llmResult['description_status']);
-            $advisedText   = (string)$llmResult['advised_topics'];
-            $advisedStatus = intval($llmResult['advised_topics_status']);
+            // 仅当模板真正引用了 LLM 占位符（llm_description / ai_content_analysis /
+            // ai_advised_topics / llm_advised_topics）时才调用 LLM，避免无谓的请求与开销。
+            $llmNeed = $this->detectLlmTemplateNeed(
+                $task['template_id'],
+                $task['journal_id'],
+                intval($task['style_id'] ?? 0)
+            );
 
-            $expert['llm_description']    = $llmText;
-            $expert['ai_advised_topics']  = $advisedText;
-            $expert['role']               = $this->mapExpertTypeRole($expertType);
+            if (!$llmNeed['need']) {
+                $llmText       = '';
+                $llmStatus     = 0;
+                $advisedText   = '';
+                $advisedStatus = 0;
+                $expert['llm_description']   = '';
+                $expert['ai_advised_topics'] = '';
+                $expert['role']              = $this->mapExpertTypeRole($expertType);
+                $this->log("prepareSingleEmail log_id={$logId} skip_llm (template has no llm placeholders)");
+            } else {
+                // 一次 LLM 调用生成两段内容（description + advised_topics）
+                $llmResult = [
+                    'description'           => '',
+                    'description_status'    => 0,
+                    'advised_topics'        => '',
+                    'advised_topics_status' => 0,
+                ];
+                try {
+                    $llm = new PromotionLlmService();
+                    $llmResult = $llm->generateEmailContent(
+                        $expert,
+                        $journal ?: [],
+                        $overlapFields,
+                        $taskFields,
+                        $fieldSet
+                    );
+                } catch (\Exception $e) {
+                    $fbDesc = '';
+                    $fbAdvised = '';
+                    try {
+                        $fbSvc = isset($llm) ? $llm : new PromotionLlmService();
+                        $fbDesc = $fbSvc->getFallback();
+                        $fbAdvised = $fbSvc->getAdvisedFallback();
+                    } catch (\Exception $ignore) {
+                    }
+                    $llmResult = [
+                        'description'           => $fbDesc,
+                        'description_status'    => 2,
+                        'advised_topics'        => $fbAdvised,
+                        'advised_topics_status' => 2,
+                    ];
+                    $this->log("prepareSingleEmail log_id={$logId} llm_exception=" . $e->getMessage());
+                }
+                $llmText       = (string)$llmResult['description'];
+                $llmStatus     = intval($llmResult['description_status']);
+                $advisedText   = (string)$llmResult['advised_topics'];
+                $advisedStatus = intval($llmResult['advised_topics_status']);
+
+                $expert['llm_description']    = $llmText;
+                $expert['ai_advised_topics']  = $advisedText;
+                $expert['role']               = $this->mapExpertTypeRole($expertType);
+            }
         }
 
         $expertVars  = $this->buildExpertVars($expert);
@@ -935,6 +954,73 @@ class PromotionService
 
     // ==================== Template Rendering ====================
 
+    /**
+     * 检测邮件模板（含 style 头尾）是否包含需要 LLM 生成的占位符。
+     *
+     * @return array{need:bool,need_description:bool,need_advised_topics:bool,tags:array<int,string>}
+     */
+    public function detectLlmTemplateNeed($templateId, $journalId, $styleId = 0)
+    {
+        $descriptionTags = ['llm_description', 'ai_content_analysis'];
+        $advisedTags     = ['ai_advised_topics', 'llm_advised_topics'];
+        $allTags         = array_merge($descriptionTags, $advisedTags);
+
+        $parts = [];
+        $tpl = Db::name('mail_template')
+            ->where('template_id', $templateId)
+            ->where('journal_id', $journalId)
+            ->where('state', 0)
+            ->find();
+        if ($tpl) {
+            $parts[] = (string)($tpl['subject'] ?? '');
+            $parts[] = (string)($tpl['body_html'] ?? '');
+        }
+        $styleId = intval($styleId);
+        if ($styleId > 0) {
+            $style = Db::name('mail_style')->where('style_id', $styleId)->where('state', 0)->find();
+            if ($style) {
+                $parts[] = (string)($style['header_html'] ?? '');
+                $parts[] = (string)($style['footer_html'] ?? '');
+            }
+        }
+
+        $haystack = implode("\n", $parts);
+        $found    = [];
+        foreach ($allTags as $tag) {
+            if ($this->templateContainsVar($haystack, $tag)) {
+                $found[] = $tag;
+            }
+        }
+
+        $needDesc    = (bool) array_intersect($found, $descriptionTags);
+        $needAdvised = (bool) array_intersect($found, $advisedTags);
+
+        return [
+            'need'                => !empty($found),
+            'need_description'    => $needDesc,
+            'need_advised_topics' => $needAdvised,
+            'tags'                => $found,
+        ];
+    }
+
+    /**
+     * 模板是否包含某变量占位符（支持 {{ var }} 与 {var}）。
+     */
+    protected function templateContainsVar($haystack, $varName)
+    {
+        if (!is_string($haystack) || $haystack === '' || $varName === '') {
+            return false;
+        }
+        $quoted = preg_quote($varName, '/');
+        if (preg_match('/\{\{\s*' . $quoted . '\s*\}\}/', $haystack)) {
+            return true;
+        }
+        if (strpos($haystack, '{' . $varName . '}') !== false) {
+            return true;
+        }
+        return false;
+    }
+
     public function renderFromTemplate($templateId, $journalId, $varsJson, $styleId = 0)
     {
         $tpl = Db::name('mail_template')->where('template_id', $templateId)->where('journal_id', $journalId)->where('state', 0)->find();