diff --git a/src/core/controls/EsDragControl2.ts b/src/core/controls/EsDragControl2.ts
index f727191..0bce29a 100644
--- a/src/core/controls/EsDragControl2.ts
+++ b/src/core/controls/EsDragControl2.ts
@@ -66,18 +66,20 @@ export default class DragControl2 implements IControls {
    * 清理拖拽状态
    */
   private cleanupDrag(): void {
-    this.viewport.renderer.domElement.style.cursor = 'auto'
-    this.isDragging = false
-    this.isPointerDown = false
-    this.dragStartMouse.set(NaN, NaN)
-    this.removeShadows()
+    if (this.domElement) {
+      this.domElement.style.cursor = 'auto'
+      this.isDragging = false
+      this.isPointerDown = false
+      this.dragStartMouse.set(NaN, NaN)
+      this.removeShadows()
+    }
   }
 
   /**
    * 获取当前鼠标坐标（归一化设备坐标）
    */
   private getMousePosition(clientX: number, clientY: number): THREE.Vector2 {
-    const rect = this.viewport.renderer.domElement.getBoundingClientRect()
+    const rect = this.domElement.getBoundingClientRect()
     return new THREE.Vector2(
       ((clientX - rect.left) / rect.width) * 2 - 1,
       ((clientY - rect.top) / rect.height) * -2 + 1
@@ -187,12 +189,12 @@ export default class DragControl2 implements IControls {
    * pointermove 事件处理
    */
   private onPointerMove = (event: PointerEvent): void => {
-    if (!this.enabled) return
+    if (!this.enabled || !this.domElement) return
 
     if (!isNaN(this.dragStartMouse.x) && !isNaN(this.dragStartMouse.y) && this.dragShadows) {
       this.isDragging = true
       // 更新鼠标样式
-      this.viewport.renderer.domElement.style.cursor = 'grabbing'
+      this.domElement.style.cursor = 'grabbing'
 
       // 更新阴影位置（锁定 Y 轴）
       this.updateShadows(new THREE.Vector2(CurrentMouseInfo.x, CurrentMouseInfo.z))
@@ -202,9 +204,9 @@ export default class DragControl2 implements IControls {
       const mouse = this.getMousePosition(event.clientX, event.clientY)
       const intersected = this.getIntersectedDraggableObject(mouse)
       if (intersected) {
-        this.viewport.renderer.domElement.style.cursor = 'grab'
+        this.domElement.style.cursor = 'grab'
       } else {
-        this.viewport.renderer.domElement.style.cursor = 'auto'
+        this.domElement.style.cursor = 'auto'
       }
     }
   }
@@ -269,9 +271,10 @@ export default class DragControl2 implements IControls {
    * 取消当前拖拽状态
    */
   cancelDrag(): void {
+    if (!this.domElement) return
     if (this.isDragging || this.isPointerDown) {
       this.cleanupDrag()
-      this.viewport.renderer.domElement.style.cursor = 'auto'
+      this.domElement.style.cursor = 'auto'
       this.viewport.controls.enabled = true
     }
   }