diff --git a/backend/ai-core/internal/background/thinker.go b/backend/ai-core/internal/background/thinker.go
index 2ff0d49..298dd2c 100644
--- a/backend/ai-core/internal/background/thinker.go
+++ b/backend/ai-core/internal/background/thinker.go
@@ -511,7 +511,7 @@ func NewThinker(
 		lightThinkEnabled:   cfg.LightThinkEnabled,
 		lightThinkInterval:  cfg.LightThinkInterval,
 		silenceTimeout:      cfg.SilenceTimeout,
-		proactiveMsgMinGap:  getEnvDuration("PROACTIVE_MSG_MIN_GAP_SEC", 0), // 默认关闭频控
+		proactiveMsgMinGap:  getEnvDuration("PROACTIVE_MSG_MIN_GAP_SEC", 60), // 默认1分钟
 		postChatDelay:       cfg.PostChatDelay,
 		minThinkGap:         cfg.MinThinkGap,
 		offlineThinkGap:     cfg.OfflineThinkGap,