diff --git a/common/util/mapping.go b/common/util/mapping.go
index a752c47..860c0b7 100644
--- a/common/util/mapping.go
+++ b/common/util/mapping.go
@@ -160,6 +160,11 @@ func MergeSystemPrompt(messages map[string]any, prompt, skills string, requestMa
 
 	msgJson := gjson.New(messages)
 
+	// 如果有 rounds，加前缀
+	if msgJson.Get("rounds.0").Val() != nil {
+		systemPath = "rounds.0." + systemPath
+	}
+
 	existing := msgJson.Get(systemPath).String()
 	if existing != "" {
 		systemContent = existing + "\n" + systemContent