diff --git a/protos/stationLayoutGraphics.proto b/protos/stationLayoutGraphics.proto
index 455a839..f1c0501 100644
--- a/protos/stationLayoutGraphics.proto
+++ b/protos/stationLayoutGraphics.proto
@@ -234,6 +234,18 @@ message Signal {
   int32 index = 7;       //索引
   RelatedRef refDev = 8; //关联设备（区段/道岔）
   repeated string centralizedStations = 9; // 集中站列表
+  // 信号机类型枚举
+  enum ModelType{
+     N = 0;//无效未知
+     HL = 1;//红绿，从左向右，最左边为靠近灯座的灯
+     HLU_FU = 2;//红绿黄，封黄灯
+     HLU = 3;//红绿黄
+     HLU_FL = 4;//红绿黄，封绿
+     AB = 5;//蓝白
+     HBU = 6;//红白黄
+  }
+  // 信号机类型
+  ModelType mt = 10;
 }
 
 /** 物理区段(包含岔区和非岔区) */