diff --git a/example/Vulkan/VulkanAppFramework.h b/example/Vulkan/VulkanAppFramework.h
index dee49b6a..503aee21 100644
--- a/example/Vulkan/VulkanAppFramework.h
+++ b/example/Vulkan/VulkanAppFramework.h
@@ -215,7 +215,7 @@ private:
 protected:
 
     WalkerCamera                camera;
-    float                       move_speed=0.01;
+    float                       move_speed=1;
 
 public:
 
@@ -271,15 +271,15 @@ public:
         if(key_status[kbA])camera.Left      (move_speed);else
         if(key_status[kbD])camera.Right     (move_speed);else
 
-        if(key_status[kbLeft    ])camera.WrapLeftRotate (move_speed*100);else
-        if(key_status[kbRight   ])camera.WrapRightRotate(move_speed*100);else
-        if(key_status[kbUp      ])camera.WrapUpRotate   (move_speed*100);else
-        if(key_status[kbDown    ])camera.WrapDownRotate (move_speed*100);else
+        if(key_status[kbLeft    ])camera.WrapLeftRotate (move_speed);else
+        if(key_status[kbRight   ])camera.WrapRightRotate(move_speed);else
+        if(key_status[kbUp      ])camera.WrapUpRotate   (move_speed);else
+        if(key_status[kbDown    ])camera.WrapDownRotate (move_speed);else
 
-        if(key_status[kbHome    ])camera.ForwardTilt    (move_speed*100);else
-        if(key_status[kbEnd     ])camera.LeaningBack    (move_speed*100);else
-        if(key_status[kbDelete  ])camera.LeftRotate     (move_speed*100);else
-        if(key_status[kbPageDown])camera.RightRotate    (move_speed*100);else
+        if(key_status[kbHome    ])camera.ForwardTilt    (move_speed);else
+        if(key_status[kbEnd     ])camera.LeaningBack    (move_speed);else
+        if(key_status[kbDelete  ])camera.LeftRotate     (move_speed);else
+        if(key_status[kbPageDown])camera.RightRotate    (move_speed);else
             return;
 
         RefreshCameraUBO();
@@ -287,8 +287,8 @@ public:
 
     void KeyPress(KeyboardButton kb)override
     {
-        if(kb==kbMinus)move_speed*=0.9;else
-        if(kb==kbEquals)move_speed*=1.1;else
+        if(kb==kbMinus)move_speed*=0.9f;else
+        if(kb==kbEquals)move_speed*=1.1f;else
             return;
 
         RefreshCameraUBO();
diff --git a/inc/hgl/graph/Camera.h b/inc/hgl/graph/Camera.h
index 80744ca8..b483a311 100644
--- a/inc/hgl/graph/Camera.h
+++ b/inc/hgl/graph/Camera.h
@@ -47,8 +47,6 @@ namespace hgl
         */
         struct WalkerCamera:public Camera
         {
-            Vector4f foot;      //脚位置
-
         protected:
 
             /**
@@ -57,7 +55,6 @@ namespace hgl
             */
             void Move(const Vector4f &move_dist)
             {
-                foot+=move_dist;
                 eye+=move_dist;
                 center+=move_dist;
             }
@@ -86,16 +83,13 @@ namespace hgl
 
         public: //方法
 
-            virtual void Backward(float step=0.01)                                                  ///<向后
-            {
-                Move(cross(cross(center-eye,up_vector),up_vector)*step);
-            }
+            virtual void Backward(float step=0.01){Move((eye-center)*step/length(eye,center));}     ///<向后
             virtual void Forward(float step=0.01){Backward(-step);}                                 ///<向前
 
-            virtual void Up(float step=0.01){Move(length(eye,center)*step*up_vector);}              ///<向上
+            virtual void Up(float step=0.01){Move(step*up_vector);}                                 ///<向上
             virtual void Down(float step=0.01){Up(-step);}                                          ///<向下
 
-            virtual void Right(float step=0.01){Move(cross(center-eye,up_vector)*step);}            ///<向右
+            virtual void Right(float step=0.01){Move(normalized(cross(center-eye,up_vector))*step);}///<向右
             virtual void Left(float step=0.01){Right(-step);}                                       ///<向左
 
         public: //以自身为中心旋转