diff --git a/src/core/mapHelper.js b/src/core/mapHelper.js
index e881941..94d6a18 100644
--- a/src/core/mapHelper.js
+++ b/src/core/mapHelper.js
@@ -19,11 +19,6 @@ class MapHelper {
     if (!this._map) return
 
     if (is3D) {
-      try {
-        this._map.setProjection('globe')
-      } catch (_) {
-        /* ignore */
-      }
       this._map.easeTo({ pitch: 45, bearing: 0, duration: 0 })
       this._map.dragRotate.enable()
       this._map.touchZoomRotate.enableRotation()
@@ -32,12 +27,8 @@ class MapHelper {
     }
 
     if (is2D) {
-      // 航线/回放编辑需要平面投影；globe 下短航线 fitBounds 易失效
-      try {
-        this._map.setProjection('mercator')
-      } catch (_) {
-        /* ignore */
-      }
+      // 只锁俯仰/旋转；投影由 setProjection 单独控制
+      // 监控要 globe 圆形地球，航线编辑要 mercator
       this._map.easeTo({ pitch: 0, bearing: 0, duration: 0 })
       this._map.dragRotate.disable()
       this._map.touchZoomRotate.disableRotation()
@@ -46,6 +37,15 @@ class MapHelper {
     }
   }
 
+  setProjection(name) {
+    if (!this._map || !name) return
+    try {
+      this._map.setProjection(name)
+    } catch (_) {
+      /* ignore */
+    }
+  }
+
   replaceMapContainer(newParent) {
     if (!this._map || !newParent) return
 
diff --git a/src/views/MonitorView/MonitorView.vue b/src/views/MonitorView/MonitorView.vue
index 960e8ae..5a2e5ab 100644
--- a/src/views/MonitorView/MonitorView.vue
+++ b/src/views/MonitorView/MonitorView.vue
@@ -613,6 +613,7 @@ async function setupMap() {
   mapInstance = map
   if (typeof window !== 'undefined') window.__LAIC_MAP__ = map
   mapHelper.toggleMapMode({ is2D: true })
+  mapHelper.setProjection('globe')
   updateMapScale()
 
   let readyStarted = false
diff --git a/src/views/TasksView/TasksView.vue b/src/views/TasksView/TasksView.vue
index 992dd67..723304f 100644
--- a/src/views/TasksView/TasksView.vue
+++ b/src/views/TasksView/TasksView.vue
@@ -794,6 +794,7 @@ async function attachRouteMap() {
   routeMapInstance = map
   mapHelper.replaceMapContainer(host)
   mapHelper.toggleMapMode({ is2D: true })
+  mapHelper.setProjection('mercator')
   routeMapAttached = true
   routeMapReady.value = false