diff --git a/src/GraphicsSystem/CursorViewer.ts b/src/GraphicsSystem/CursorViewer.ts
index 3a9afd662..500d36576 100644
--- a/src/GraphicsSystem/CursorViewer.ts
+++ b/src/GraphicsSystem/CursorViewer.ts
@@ -19,6 +19,9 @@ export class CursorViewer
     m_LastEntity: THREE.Object3D;
     m_LastIndex: number;
 
+    private m_Width:number;
+    private m_Height:number;
+
     //容器节点
     private m_DomEl: HTMLElement;
     constructor(container: HTMLElement)
@@ -28,7 +31,7 @@ export class CursorViewer
         this.InitCamera();
         this.InitRender();
         this.InitCursor();
-        this.SetSize(container.scrollWidth, container.scrollHeight);
+        this.onSize();
     }
 
     get Scene() { return this.m_Scene; }
@@ -37,14 +40,10 @@ export class CursorViewer
     private InitCamera()
     {
         this.m_Camera = new CameraControl();
-        this.m_Camera.ViewHeight = this.m_DomEl.scrollHeight;
-        this.m_Camera.SetSize(this.m_DomEl.scrollWidth, this.m_DomEl.scrollHeight);
+        this.m_Camera.ViewHeight = 1;
+        this.m_Camera.SetSize(1, 1);
         this.m_Camera.Update();
     }
-    onSize()
-    {
-        this.SetSize(this.m_DomEl.scrollWidth, this.m_DomEl.scrollHeight);
-    }
     private InitRender()
     {
         let canvas = document.createElement("canvas");
@@ -112,34 +111,28 @@ export class CursorViewer
      */
     ScreenPointToViewerPoint(p: THREE.Vector3)
     {
-        let width = this.m_DomEl.scrollWidth;
-        if (width % 2 == 1)
-        {
-            width -= 1;
-        }
-        let height = this.m_DomEl.scrollHeight;
-        if (height % 2 == 1)
-        {
-            height -= 1;
-        }
-        p.x = p.x - this.m_DomEl.scrollWidth * 0.5;
-        p.y = this.m_DomEl.scrollHeight * 0.5 - p.y;
+        p.x = p.x - this.m_Width * 0.5;
+        p.y = this.m_Height * 0.5 - p.y;
     }
-    SetSize(width, height)
+
+    onSize()
     {
-        if (width % 2 == 1)
+        this.m_Width = this.m_DomEl.scrollWidth;
+        this.m_Height = this.m_DomEl.scrollHeight;
+        if (this.m_Width  % 2 == 1)
         {
-            width -= 1;
+            this.m_Width  -= 1;
         }
-        if (height % 2 == 1)
+        if (this.m_Height % 2 == 1)
         {
-            height -= 1;
+            this.m_Height -= 1;
         }
-        this.m_Camera.SetSize(width, height);
-        this.m_Camera.ViewHeight = height;
+
+        this.m_Camera.SetSize(this.m_Width, this.m_Height);
+        this.m_Camera.ViewHeight = this.m_Height;
         this.m_Camera.Update();
 
-        this.m_Render.setSize(width, height);
+        this.m_Render.setSize(this.m_Width, this.m_Height);
     }
 
     HideCursor()