diff --git a/libraries/mogo-adas-data/src/main/proto/road_overview_events.proto b/libraries/mogo-adas-data/src/main/proto/road_overview_events.proto
index 77e8e653b4..e8e18ef999 100644
--- a/libraries/mogo-adas-data/src/main/proto/road_overview_events.proto
+++ b/libraries/mogo-adas-data/src/main/proto/road_overview_events.proto
@@ -1,11 +1,14 @@
-syntax = "proto3";
+syntax = "proto2";
 package mogo.v2x;
 
+//下发的时机与频率：
+//自车在自动驾驶状态时，云端推送自动驾驶路线上的全局事件, 频率 1HZ;  手动驾驶不推送；
 message RoadOverviewData {
- uint64 msgId = 1; //  消息ID
- uint64 timestamp = 2; //unix时间戳
- bytes  constructData= 3; //施工  RSI_PB
- bytes  triangleData= 4; //三角牌 RSI_PB
- bytes  congestionData= 5; //拥堵 RSI_PB
- bytes  parkingViolationData= 6; //违停 ---包含 静态障碍车 RSM_PB
+  required  uint64 msgId = 1; //  消息ID
+  required  uint64 timestamp = 2; //unix时间戳
+  optional  bytes  constructData = 3; //施工  RSI_PB
+  optional  bytes  triangleData = 4; //三角牌  RSI_PB
+  optional  bytes  congestionData = 5; //拥堵  RSI_PB
+  optional  bytes  parkingViolationData = 6; //违停 ---包含 静态障碍车 RSM_PB
+  optional  uint32 eventCount = 7; //全部事件数据
 }