diff --git a/protos/stationLayoutGraphics.proto b/protos/stationLayoutGraphics.proto
index e98b40a..7ccf355 100644
--- a/protos/stationLayoutGraphics.proto
+++ b/protos/stationLayoutGraphics.proto
@@ -363,11 +363,10 @@ message CalculateLink {
   CommonInfo common = 1;
   repeated Point points = 2;
   int32 length = 3;           //长度，mm
-  RelatedRef aRelatedRef = 4; // A端（最小端）关联的端点
-  RelatedRef bRelatedRef = 5; // B端（最大端）关联的端点
+  RelatedRef aRelatedRef = 4; // A端（最小端）关联的端点 （道岔端点）
+  RelatedRef bRelatedRef = 5; // B端（最大端）关联的端点 （道岔端点）
   repeated DevicePosition devicePositions = 6; //设备在link上的位置
   int32 index = 7; //link唯一标识
-  bool ab = 8; // 是否是从A->B, 道岔直连为false
   message DevicePosition {
     int32 offset = 1;
     string deviceId = 2;