diff --git a/backend/generation-service/src/main/java/com/artedu/generation/controller/GenerationController.java b/backend/generation-service/src/main/java/com/artedu/generation/controller/GenerationController.java
index cc65382..b23c15c 100644
--- a/backend/generation-service/src/main/java/com/artedu/generation/controller/GenerationController.java
+++ b/backend/generation-service/src/main/java/com/artedu/generation/controller/GenerationController.java
@@ -136,8 +136,8 @@ public class GenerationController {
         List<ArchiveMessage> messages;
         boolean isGroupChat = roomid != null && !roomid.isEmpty();
 
-        // 查最近 7 天，避免今天没聊天就找不到记录
-        long startTime = get7DaysAgoStartTime();
+        // 查最近 今 天，避免今天没聊天就找不到记录
+        long startTime = getTodayStartTime();
         long endTime = getTodayEndTime();
 
         if (isGroupChat) {