diff --git a/protos/stationLayoutGraphics.proto b/protos/stationLayoutGraphics.proto
index d5bcdfb..7935b3a 100644
--- a/protos/stationLayoutGraphics.proto
+++ b/protos/stationLayoutGraphics.proto
@@ -167,11 +167,19 @@ message RunLine {
 }
 
 message Section {
+  enum SectionType {
+    Physical = 0;
+    Logic = 1;
+    TurnoutPhysical = 2;
+  }
+
   CommonInfo common = 1;
   string code = 2;
   repeated Point points = 3;
-  RelatedRef paRef = 4; // 区段A端关联的设备
-  RelatedRef pbRef = 5; // 区段B端关联的设备
+  RelatedRef paRef = 4;        // 区段A端关联的设备
+  RelatedRef pbRef = 5;        // 区段B端关联的设备
+  SectionType sectionType = 6; // 区段类型
+  repeated string children = 7; // 物理区段的下属逻辑区段/道岔物理区段的下属道岔
 }
 
 message PathLine {