diff --git a/src/Editor/CameraControls.ts b/src/Editor/CameraControls.ts
index be9d01b9e..77c8d15db 100644
--- a/src/Editor/CameraControls.ts
+++ b/src/Editor/CameraControls.ts
@@ -141,6 +141,9 @@ export class CameraControls
         this.m_State = CameraControlState.Rotate;
         this.m_Viewer.UpdateLockTarget();
     }
+
+    //最后一次按中键的时间
+    lastMiddleClickTime = 0;
     //鼠标    
     onMouseDown = (event: MouseEvent) =>
     {
@@ -161,6 +164,15 @@ export class CameraControls
                 }
             case MouseKey.Middle:
                 {
+                    let curTime = Date.now();
+                    let t = curTime - this.lastMiddleClickTime;
+                    this.lastMiddleClickTime = curTime;
+                    if (t < 350)
+                    {
+                        this.m_Viewer.ZoomAll();
+                        return;
+                    }
+
                     if (this.m_KeyDown.get(KeyBoard.Control))
                     {
                         this.beginRotate();
diff --git a/src/GraphicsSystem/CameraControl.ts b/src/GraphicsSystem/CameraControl.ts
index 93a31591e..ee3afe664 100644
--- a/src/GraphicsSystem/CameraControl.ts
+++ b/src/GraphicsSystem/CameraControl.ts
@@ -2,6 +2,11 @@ import * as THREE from 'three';
 import { Vector3 } from 'three';
 import { Orbit } from '../Geometry/Orbit';
 
+const ViewScopeSize = 4e4;
+//相机活动范围
+const ViewScopeMin = new Vector3(-ViewScopeSize, -ViewScopeSize * 0.7, -ViewScopeSize);
+const ViewScopeMax = ViewScopeMin.clone().negate();
+
 /**
  * 
  * 相机的控制.
@@ -30,12 +35,16 @@ export class CameraControl
     //观察的轨道.
     private m_Orbit: Orbit = new Orbit();
 
+    //最大最小视口高度
+    m_MinViewHeight = 1e-3;
+    m_MaxViewHeight = 3e4;
+
     constructor()
     {
         this.m_CameraArray.set(THREE.OrthographicCamera, new THREE.OrthographicCamera(-2, 2, 2, -2,
-            -10000, 10000));
+            -ViewScopeSize, ViewScopeSize));
 
-        this.m_CameraArray.set(THREE.PerspectiveCamera, new THREE.PerspectiveCamera(50, 1, 0.01, 10000));
+        this.m_CameraArray.set(THREE.PerspectiveCamera, new THREE.PerspectiveCamera(50, 1, 0.01, ViewScopeSize));
 
         this.m_CurCamera = this.m_CameraArray.get(THREE.OrthographicCamera);
 
@@ -60,7 +69,7 @@ export class CameraControl
     }
     set ViewHeight(height)
     {
-        this.m_ViewHeight = THREE.Math.clamp(height, 1e-8, 1e8);
+        this.m_ViewHeight = THREE.Math.clamp(height, this.m_MinViewHeight, this.m_MaxViewHeight);
     }
 
     SetSize(width: number, height: number)
@@ -81,6 +90,7 @@ export class CameraControl
         mouseMove.multiplyScalar(-this.m_ViewHeight / this.m_Height);
         mouseMove.applyQuaternion(this.Camera.quaternion);
         this.m_Target.add(mouseMove);
+        this.m_Target.clamp(ViewScopeMin, ViewScopeMax);
         this.Update();
     }
     Rotate(mouseMove: THREE.Vector3, target: THREE.Vector3)
@@ -114,7 +124,7 @@ export class CameraControl
         if (this.Camera instanceof THREE.OrthographicCamera)
         {
             this.ViewHeight *= scale;
-            if (scaleCenter)
+            if (scaleCenter && this.m_ViewHeight < this.m_MaxViewHeight)
             {
                 this.m_Target.sub(scaleCenter);
                 this.m_Target.multiplyScalar(scale);
@@ -131,7 +141,7 @@ export class CameraControl
     }
     ZoomExtensBox3(box3: THREE.Box3)
     {
-        if (!box3) return;
+        if (!box3 || box3.isEmpty()) return;
         this.Camera.updateMatrixWorld(false);
         //变换到相机坐标系
         box3.applyMatrix4(this.Camera.matrixWorldInverse);
@@ -148,11 +158,11 @@ export class CameraControl
         //
         if (aspectRatio > viewAspectRatio)
         {
-            this.m_ViewHeight = size.x / viewAspectRatio;
+            this.ViewHeight = size.x / viewAspectRatio;
         }
         else
         {
-            this.m_ViewHeight = size.y;
+            this.ViewHeight = size.y;
         }
         this.Update();
     }