diff --git a/protos/MapInfoProto.proto b/protos/MapInfoProto.proto
index c0ec715..ab9cbf3 100644
--- a/protos/MapInfoProto.proto
+++ b/protos/MapInfoProto.proto
@@ -50,7 +50,7 @@ import "CommonProto.proto";
 		// 奖励
 		optional Drop drop = 3;
 		// 更新主线任务
-		repeated Mission mission = 4;
+		optional Mission mission = 4;
 		// 探索地图剩余时间（秒）
 		optional int32 leftTime = 5; 
 	}