diff --git a/internal/service/ai_bookkeeping_service.go b/internal/service/ai_bookkeeping_service.go
index 9430481..3b52ed4 100644
--- a/internal/service/ai_bookkeeping_service.go
+++ b/internal/service/ai_bookkeeping_service.go
@@ -558,15 +558,20 @@ func (s *AIBookkeepingService) GenerateDailyInsight(ctx context.Context, userID
 	}
 
 	// 2. Construct Prompt
-    prompt := fmt.Sprintf(`[SYSTEM: You are a personal financial analyst. Your task is to provide a brief, warm, and actionable daily financial insight based on the provided data.]
-
+	prompt := fmt.Sprintf(`System: 你是 Novault 首席财务AI，也是用户的贴身管家。你的点评需要非常有温度、有依据。
 DATA:
 %s
 
-TASK:
-Output a JSON object with exactly two fields: "spending" and "budget".
-1. "spending": A comment on today's spending (max 40 chars). Warm tone. Mention weekday if relevant. Praise streaks.
-2. "budget": Actionable advice on budget status (max 40 chars).
+Task:
+请输出 JSON 对象（无 markdown 标记）：
+1. "spending": 针对今日支出的点评（40字内）。
+   - 必须结合日期（如周五可以放松，周一要收心）。
+   - 如果有【连续记账】成就（>3天），请顺带夸奖。
+   - 如果对比上周同日波动大，请指出。
+   - 结合最大支出进行调侃。
+   
+2. "budget": 针对预算状况的建议（40字内）。
+   - 结合月度进度，给出具体行动指南。
 
 OUTPUT FORMAT (JSON ONLY, NO MARKDOWN):
 {"spending": "...", "budget": "..."}`, string(dataBytes))