diff --git a/pets-be/internal/config/config.go b/pets-be/internal/config/config.go
index 6e509dd..3b7e72a 100644
--- a/pets-be/internal/config/config.go
+++ b/pets-be/internal/config/config.go
@@ -118,6 +118,7 @@ func setDefaults(v *viper.Viper) {
 
 	v.SetDefault("wechat.app_id", "")
 	v.SetDefault("wechat.app_secret", "")
+	v.SetDefault("wechat.msg_token", "") // 用 PETS_WECHAT_MSG_TOKEN 覆盖
 
 	v.SetDefault("auth.dev_login", false)