diff --git a/cocos/physics/CCPhysicsBody.cpp b/cocos/physics/CCPhysicsBody.cpp
index bc38e34e32..233e55f157 100644
--- a/cocos/physics/CCPhysicsBody.cpp
+++ b/cocos/physics/CCPhysicsBody.cpp
@@ -69,10 +69,6 @@ PhysicsBody::PhysicsBody()
 , _linearDamping(0.0f)
 , _angularDamping(0.0f)
 , _tag(0)
-, _categoryBitmask(UINT_MAX)
-, _collisionBitmask(0)
-, _contactTestBitmask(UINT_MAX)
-, _group(0)
 , _positionResetTag(false)
 , _rotationResetTag(false)
 , _rotationOffset(0)
@@ -422,11 +418,6 @@ PhysicsShape* PhysicsBody::addShape(PhysicsShape* shape, bool addMassAndMoment/*
         }
         
         _shapes.pushBack(shape);
-        
-        if (_group != CP_NO_GROUP && shape->getGroup() == CP_NO_GROUP)
-        {
-            shape->setGroup(_group);
-        }
     }
     
     return shape;
@@ -829,34 +820,64 @@ void PhysicsBody::update(float delta)
 
 void PhysicsBody::setCategoryBitmask(int bitmask)
 {
-    _categoryBitmask = bitmask;
-    
     for (auto& shape : _shapes)
     {
         shape->setCategoryBitmask(bitmask);
     }
 }
 
+int PhysicsBody::getCategoryBitmask() const
+{
+    if (!_shapes.empty())
+    {
+        return _shapes.front()->getCategoryBitmask();
+    }
+    else
+    {
+        return UINT_MAX;
+    }
+}
+
 void PhysicsBody::setContactTestBitmask(int bitmask)
 {
-    _contactTestBitmask = bitmask;
-    
     for (auto& shape : _shapes)
     {
         shape->setContactTestBitmask(bitmask);
     }
 }
 
+int PhysicsBody::getContactTestBitmask() const
+{
+    if (!_shapes.empty())
+    {
+        return _shapes.front()->getContactTestBitmask();
+    }
+    else
+    {
+        return 0x00000000;
+    }
+}
+
 void PhysicsBody::setCollisionBitmask(int bitmask)
 {
-    _collisionBitmask = bitmask;
-    
     for (auto& shape : _shapes)
     {
         shape->setCollisionBitmask(bitmask);
     }
 }
 
+int PhysicsBody::getCollisionBitmask() const
+{
+    if (!_shapes.empty())
+    {
+        return _shapes.front()->getCollisionBitmask();
+    }
+    else
+    {
+        return UINT_MAX;
+    }
+}
+
 void PhysicsBody::setGroup(int group)
 {
     for (auto& shape : _shapes)
@@ -865,6 +886,18 @@ void PhysicsBody::setGroup(int group)
     }
 }
 
+int PhysicsBody::getGroup() const
+{
+    if (!_shapes.empty())
+    {
+        return _shapes.front()->getGroup();
+    }
+    else
+    {
+        return 0;
+    }
+}
+
 void PhysicsBody::setPositionOffset(const Vec2& position)
 {
     if (!_positionOffset.equals(position))
diff --git a/cocos/physics/CCPhysicsBody.h b/cocos/physics/CCPhysicsBody.h
index 6ed512f1f2..53c2f23b21 100644
--- a/cocos/physics/CCPhysicsBody.h
+++ b/cocos/physics/CCPhysicsBody.h
@@ -171,12 +171,12 @@ public:
      * The default value is 0xFFFFFFFF (all bits set).
      */
     void setCollisionBitmask(int bitmask);
-    /** get the category bit mask */
-    inline int getCategoryBitmask() const { return _categoryBitmask; }
-    /** get the contact test bit mask */
-    inline int getContactTestBitmask() const { return _contactTestBitmask; }
-    /** get the collision bit mask */
-    inline int getCollisionBitmask() const { return _collisionBitmask; }
+    /** Return bitmask of first shape, if there is no shape in body, return default value.(0xFFFFFFFF) */
+    int getCategoryBitmask() const;
+    /** Return bitmask of first shape, if there is no shape in body, return default value.(0x00000000) */
+    int getContactTestBitmask() const;
+    /** Return bitmask of first shape, if there is no shape in body, return default value.(0xFFFFFFFF) */
+    int getCollisionBitmask() const;
     
     /** 
      * set the group of body
@@ -184,8 +184,8 @@ public:
      * it have high priority than bit masks
      */
     void setGroup(int group);
-    /** get the group of body */
-    inline int getGroup() const { return _group; }
+    /** Return bitmask of first shape, if there is no shape in body, return default value.(0) */
+    int getGroup() const;
     
     /** get the body position. */
     Vec2 getPosition() const;
@@ -339,11 +339,6 @@ protected:
     float _angularDamping;
     int _tag;
     
-    int _categoryBitmask;
-    int _collisionBitmask;
-    int _contactTestBitmask;
-    int _group;
-    
     bool _positionResetTag;     /// To avoid reset the body position when body invoke Node::setPosition().
     bool _rotationResetTag;     /// To avoid reset the body rotation when body invoke Node::setRotation().
     Vec2 _positionOffset;
diff --git a/cocos/physics/CCPhysicsShape.h b/cocos/physics/CCPhysicsShape.h
index 7f14066595..cc72a828ef 100644
--- a/cocos/physics/CCPhysicsShape.h
+++ b/cocos/physics/CCPhysicsShape.h
@@ -140,6 +140,11 @@ public:
     inline void setCollisionBitmask(int bitmask) { _collisionBitmask = bitmask; }
     inline int getCollisionBitmask() const { return _collisionBitmask; }
     
+    /**
+     * set the group of body
+     * Collision groups let you specify an integral group index. You can have all fixtures with the same group index always collide (positive index) or never collide (negative index)
+     * it have high priority than bit masks
+     */
     void setGroup(int group);
     inline int getGroup() { return _group; }