diff --git a/src/main/java/club/joylink/rtss/services/draftData/DraftMapCiDataGeneratorImpl.java b/src/main/java/club/joylink/rtss/services/draftData/DraftMapCiDataGeneratorImpl.java
index 292803a2c..7917c72ec 100644
--- a/src/main/java/club/joylink/rtss/services/draftData/DraftMapCiDataGeneratorImpl.java
+++ b/src/main/java/club/joylink/rtss/services/draftData/DraftMapCiDataGeneratorImpl.java
@@ -1074,9 +1074,40 @@ public class DraftMapCiDataGeneratorImpl implements DraftMapCiDataGenerator {
 
     private RouteFls buildNpFls(Switch aSwitch) {
         RouteFls fls = new RouteFls(new SwitchElement(aSwitch, true));
+        // 暂时只生成一级侧防
         Switch linkedSwitch = aSwitch.queryLinkedSwitch();
         if (Objects.nonNull(linkedSwitch)) {
-
+            // 联动道岔存在，联动道岔定位即为一级侧防
+            RouteFls.FlsElement flsElement = new RouteFls.FlsElement(new SwitchElement(linkedSwitch, true));
+            fls.addLevel1(flsElement);
+        } else {
+            // 无联动道岔，则从道岔B区段向外查询，第一个反向信号机和经过的路径道岔位置构成一级侧防
+            Section c = aSwitch.getC();
+            if (c.getLeftSection() == null && c.getRightSection() == null) {
+                // 尽头区段，不需构成侧防
+                return null;
+            }
+            BusinessExceptionAssertEnum.DATA_ERROR.assertNotTrue(c.getLeftSection() != null && c.getRightSection() != null,
+                    String.format("道岔区段[%s]关联区段关系异常，只能最多一边关联，实际两边都关联了区段", c.debugStr()));
+            boolean right = true;
+            Section section = c.getRightSection();
+            if (c.getLeftSection() != null) { // 左向区段存在，方向向左
+                right = false;
+                section = c.getLeftSection();
+            }
+            while (Objects.nonNull(section)) {
+                Signal oppositeSignal = section.getSignalOf(!right);
+                if (Objects.nonNull(oppositeSignal)) {
+                    Section firstSection = oppositeSignal.getSection().getSectionOf(oppositeSignal.isRight());
+                    RouteFls.FlsElement flsElement;
+                    if (firstSection.isSwitchTrack()) {
+                        flsElement = new RouteFls.FlsElement(oppositeSignal, new SwitchElement(firstSection.getRelSwitch(), true));
+                    } else {
+                        flsElement = new RouteFls.FlsElement(oppositeSignal);
+                    }
+                    fls.addLevel1(flsElement);
+                }
+            }
         }
         return null;
     }
diff --git a/src/main/java/club/joylink/rtss/simulation/SimulationUser.java b/src/main/java/club/joylink/rtss/simulation/SimulationUser.java
index 8c3a659ea..8fc896b28 100644
--- a/src/main/java/club/joylink/rtss/simulation/SimulationUser.java
+++ b/src/main/java/club/joylink/rtss/simulation/SimulationUser.java
@@ -3,6 +3,9 @@ package club.joylink.rtss.simulation;
 import java.util.Set;
 
 public class SimulationUser {
+    /**
+     * 仿真用户唯一标识，并且是发布订阅消息时的用户唯一标识
+     */
     private String id;
     /**
      * 用户仿真消息订阅
diff --git a/src/main/java/club/joylink/rtss/simulation/cbtc/data/map/RouteFls.java b/src/main/java/club/joylink/rtss/simulation/cbtc/data/map/RouteFls.java
index 7144df032..55bb4a7b2 100644
--- a/src/main/java/club/joylink/rtss/simulation/cbtc/data/map/RouteFls.java
+++ b/src/main/java/club/joylink/rtss/simulation/cbtc/data/map/RouteFls.java
@@ -3,6 +3,7 @@ package club.joylink.rtss.simulation.cbtc.data.map;
 import lombok.Getter;
 import lombok.Setter;
 
+import java.util.ArrayList;
 import java.util.List;
 
 /**
@@ -26,6 +27,13 @@ public class RouteFls {
         this.base = base;
     }
 
+    public void addLevel1(FlsElement flsElement) {
+        if (level1List == null) {
+            level1List = new ArrayList<>();
+        }
+        level1List.add(flsElement);
+    }
+
     /**
      * 侧防元件
      */
@@ -48,6 +56,18 @@ public class RouteFls {
          */
         private SwitchElement fpae;
 
+        public FlsElement(SwitchElement switchElement) {
+            this.pSwitch = switchElement;
+        }
+
+        public FlsElement(Signal pSignal) {
+            this.pSignal = pSignal;
+        }
+
+        public FlsElement(Signal pSignal, SwitchElement fpae) {
+            this.pSignal = pSignal;
+            this.fpae = fpae;
+        }
     }
 
 }