diff --git a/javaTest/src/main/java/com/ft546/wcs/shadow/history/visualizer/SimulationVisualizationMapper.java b/javaTest/src/main/java/com/ft546/wcs/shadow/history/visualizer/SimulationVisualizationMapper.java
index f7a1432..4eddc6d 100644
--- a/javaTest/src/main/java/com/ft546/wcs/shadow/history/visualizer/SimulationVisualizationMapper.java
+++ b/javaTest/src/main/java/com/ft546/wcs/shadow/history/visualizer/SimulationVisualizationMapper.java
@@ -2,6 +2,7 @@ package com.ft546.wcs.shadow.history.visualizer;
 
 import com.ft546.wcs.demo.model.Site;
 import com.ft546.wcs.demo.model.VehicleSnapshot;
+import com.ft546.wcs.demo.traffic.GridMap;
 import com.ft546.wcs.shadow.history.HistoricalQueueDataset;
 import com.ft546.wcs.shadow.history.HistoricalQueueRecord;
 import com.ft546.wcs.shadow.history.simulation.HistoricalDispatchSimulationResult;
@@ -41,6 +42,8 @@ public final class SimulationVisualizationMapper {
             DateTimeFormatter.ofPattern("uuuu-MM-dd HH:mm:ss");
 
     private final HistoricalQueueDataset dataset;
+    private final RouteTopologyEvidenceMapper routeTopology =
+            new RouteTopologyEvidenceMapper();
 
     public SimulationVisualizationMapper(HistoricalQueueDataset dataset) {
         if (dataset == null) throw new IllegalArgumentException("dataset is required");
@@ -71,6 +74,8 @@ public final class SimulationVisualizationMapper {
         }
         payload.put("floors", new ArrayList<Integer>(floors));
         payload.put("sites", sites);
+        // 页面底图必须使用当前 Java 地图的真实邻接边，不能在浏览器中按坐标猜路。
+        payload.put("edges", routeTopology.fullMapEdges(input.getGridMap()));
 
         List<VehicleSnapshot> orderedVehicles =
                 new ArrayList<VehicleSnapshot>(input.getInitialVehicles());
@@ -96,7 +101,7 @@ public final class SimulationVisualizationMapper {
         List<Map<String, Object>> tasks = new ArrayList<Map<String, Object>>();
         for (SimulationTaskResult task : orderedTasks) {
             tasks.add(task(task, definitions.get(task.getSimulationTaskId()),
-                    result.getAcceleration()));
+                    result.getAcceleration(), input.getGridMap()));
         }
         List<Map<String, Object>> events = new ArrayList<Map<String, Object>>();
         for (SimulationTickEvent event : result.getEvents()) events.add(event(event));
@@ -145,7 +150,8 @@ public final class SimulationVisualizationMapper {
 
     private Map<String, Object> task(SimulationTaskResult task,
                                      HistoricalSimulationTask definition,
-                                     int acceleration) {
+                                     int acceleration,
+                                     GridMap gridMap) {
         HistoricalQueueRecord record = task.getRecord();
         List<String> historicalPath = historicalPath(record.getPathInfo());
         Long historicalDuration = historicalDuration(task);
@@ -170,6 +176,9 @@ public final class SimulationVisualizationMapper {
         value.put("simulatedVehicleId", task.getSimulatedVehicleId());
         value.put("historicalPath", historicalPath);
         value.put("plannedPath", task.getPlannedPath());
+        // 边差证据解释新旧路线在哪里重合或分叉，但不参与调度中心的规划结果。
+        value.put("pathComparison", routeTopology.compare(
+                gridMap, historicalPath, task.getPlannedPath()));
         value.put("assignedVehicles", task.getAssignedVehicles());
         value.put("status", task.getStatus().name());
         value.put("reason", task.getReason());
diff --git a/javaTest/src/test/java/com/ft546/wcs/shadow/history/visualizer/HistoricalDispatchVisualizerServerTest.java b/javaTest/src/test/java/com/ft546/wcs/shadow/history/visualizer/HistoricalDispatchVisualizerServerTest.java
index 3ec4620..a20f593 100644
--- a/javaTest/src/test/java/com/ft546/wcs/shadow/history/visualizer/HistoricalDispatchVisualizerServerTest.java
+++ b/javaTest/src/test/java/com/ft546/wcs/shadow/history/visualizer/HistoricalDispatchVisualizerServerTest.java
@@ -71,9 +71,13 @@ class HistoricalDispatchVisualizerServerTest {
         assertEquals(Boolean.FALSE, map(health.body).get("simulationBusy"));
         assertEquals(200, bootstrap.status);
         assertEquals("OFFLINE_IN_MEMORY_SIMULATION", map(bootstrap.body).get("mode"));
+        assertFalse(list(map(bootstrap.body).get("edges")).isEmpty());
         assertEquals(200, simulation.status);
         assertEquals(1, map(map(simulation.body).get("summary")).get("completedCount"));
         assertFalse(list(map(simulation.body).get("events")).isEmpty());
+        Map<String, Object> taskEvidence = map(
+                list(map(simulation.body).get("tasks")).get(0));
+        assertTrue(taskEvidence.containsKey("pathComparison"));
         assertTrue(simulation.body.contains("plannedPath"));
         assertTrue(simulation.body.contains("MOVE"));
     }
diff --git a/javaTest/src/test/java/com/ft546/wcs/shadow/history/visualizer/SimulationVisualizationMapperTest.java b/javaTest/src/test/java/com/ft546/wcs/shadow/history/visualizer/SimulationVisualizationMapperTest.java
index 40e5563..bc7c900 100644
--- a/javaTest/src/test/java/com/ft546/wcs/shadow/history/visualizer/SimulationVisualizationMapperTest.java
+++ b/javaTest/src/test/java/com/ft546/wcs/shadow/history/visualizer/SimulationVisualizationMapperTest.java
@@ -12,8 +12,10 @@ import org.junit.jupiter.api.Test;
 
 import java.util.Arrays;
 import java.util.Collections;
+import java.util.HashSet;
 import java.util.List;
 import java.util.Map;
+import java.util.Set;
 
 import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.assertFalse;
@@ -45,6 +47,7 @@ class SimulationVisualizationMapperTest {
     void bootstrapReturnsSortedSearchableSitesAndInitialVehicles() {
         Map<String, Object> payload = mapper().bootstrap(input);
         List<Map<String, Object>> sites = listOfMaps(payload.get("sites"));
+        List<Map<String, Object>> edges = listOfMaps(payload.get("edges"));
         List<Map<String, Object>> vehicles = listOfMaps(payload.get("vehicles"));
 
         assertEquals("OFFLINE_IN_MEMORY_SIMULATION", payload.get("mode"));
@@ -56,6 +59,21 @@ class SimulationVisualizationMapperTest {
         assertTrue(sites.get(0).containsKey("x"));
         assertTrue(sites.get(0).containsKey("y"));
         assertTrue(sites.get(0).containsKey("floor"));
+
+        int neighborReferences = input.getGridMap().getSites().keySet().stream()
+                .mapToInt(siteId -> input.getGridMap().getNeighbors(siteId).size())
+                .sum();
+        assertEquals(neighborReferences / 2, edges.size());
+        Set<String> edgeKeys = new HashSet<String>();
+        for (Map<String, Object> edge : edges) {
+            String from = String.valueOf(edge.get("fromSite"));
+            String to = String.valueOf(edge.get("toSite"));
+            assertTrue(input.getGridMap().getSites().containsKey(from));
+            assertTrue(input.getGridMap().getSites().containsKey(to));
+            assertTrue(from.compareTo(to) < 0);
+            assertTrue(input.getGridMap().getNeighbors(from).contains(to));
+            assertTrue(edgeKeys.add(from + "|" + to));
+        }
     }
 
     @Test
@@ -74,6 +92,15 @@ class SimulationVisualizationMapperTest {
         assertEquals(sampleTask.getPhysicalTarget(), tasks.get(0).get("physicalEndSite"));
         assertEquals(Boolean.TRUE, tasks.get(0).get("vehicleChanged"));
         assertEquals(Boolean.TRUE, tasks.get(0).get("pathChanged"));
+        Map<String, Object> comparison = map(tasks.get(0).get("pathComparison"));
+        assertEquals(0, comparison.get("sharedEdgeCount"));
+        assertEquals(sourceTask.getPlannedPath().size() - 1,
+                comparison.get("plannedOnlyEdgeCount"));
+        assertEquals(0, comparison.get("historicalOnlyEdgeCount"));
+        List<Map<String, Object>> invalidHistorical =
+                listOfMaps(comparison.get("invalidHistoricalSegments"));
+        assertEquals(1, invalidHistorical.size());
+        assertEquals("UNKNOWN_SITE", invalidHistorical.get(0).get("reason"));
         assertTrue(events.stream().anyMatch(event -> "ASSIGN".equals(event.get("eventType"))));
         assertTrue(events.stream().anyMatch(event -> "MOVE".equals(event.get("eventType"))));
         assertTrue(events.stream().anyMatch(event -> "PLC_RETRY".equals(event.get("eventType"))));