diff --git a/modules/story-summary/generate/prompt.js b/modules/story-summary/generate/prompt.js
index 86beb03..b14f534 100644
--- a/modules/story-summary/generate/prompt.js
+++ b/modules/story-summary/generate/prompt.js
@@ -49,7 +49,7 @@ const ARCS_MAX = 1500;
 const EVENT_BUDGET_MAX = 5000;
 const RELATED_EVENT_MAX = 1000;
 const SUMMARIZED_EVIDENCE_MAX = 1500;
-const UNSUMMARIZED_EVIDENCE_MAX = 5000;
+const UNSUMMARIZED_EVIDENCE_MAX = 2000;
 const TOP_N_STAR = 5;
 
 // L0 显示文本：分号拼接 vs 多行模式的阈值