diff --git a/doc/demo07_collision/collision.md b/doc/demo07_collision/collision.md
index 6aa0aa3..9e3c142 100644
--- a/doc/demo07_collision/collision.md
+++ b/doc/demo07_collision/collision.md
@@ -12,7 +12,7 @@
 ![Image text](image/collision-5.png)
 ![Image text](image/collision-6.png)
 
-# 2. 刚体
+# 2. RigidBody
 
 - 刚体是组成物理世界的基本对象，你可以将刚体想象成一个你不能看到（绘制）也不能摸到（碰撞）的带有属性的物体。
 
@@ -26,14 +26,17 @@
 - torque，扭矩
 - damp，衰减系数，值越大物体移动越慢，可以用来模拟空气摩擦力等效果。
 
-# 3. 物理实战
+# 3. 刚体
 
 - RigidBody，动态刚体，有质量，可以设置速度，会受到重力影响。
 
 - Kinematic，运动刚体，零质量，可以设置速度，不会受到重力的影响，但是可以设置速度来进行移动。
-  
+
 - Static，静态刚体，零质量，零速度，即不会受到重力或速度影响，但是可以设置他的位置来进行移动
 
 - Area2D，一块区域，能够检测到物体的碰撞，但是不会做任何操作
 
-- 碰撞检测Layer和Mask
+- 碰撞检测Layer和Mask，Layer表明当前刚体属于那一层，Mask表面当前
+
+![Image text](image/collision-9.JPG)
+![Image text](image/collision-10.JPG)
diff --git a/doc/demo07_collision/image/collision-10.JPG b/doc/demo07_collision/image/collision-10.JPG
new file mode 100644
index 0000000..d93276c
Binary files /dev/null and b/doc/demo07_collision/image/collision-10.JPG differ
diff --git a/doc/demo07_collision/image/collision-10.JPG.import b/doc/demo07_collision/image/collision-10.JPG.import
new file mode 100644
index 0000000..e0c7404
--- /dev/null
+++ b/doc/demo07_collision/image/collision-10.JPG.import
@@ -0,0 +1,34 @@
+[remap]
+
+importer="texture"
+type="StreamTexture"
+path="res://.import/collision-10.JPG-43a1d950b76c7ebd07e260480ea153e2.stex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://doc/demo07_collision/image/collision-10.JPG"
+dest_files=[ "res://.import/collision-10.JPG-43a1d950b76c7ebd07e260480ea153e2.stex" ]
+
+[params]
+
+compress/mode=0
+compress/lossy_quality=0.7
+compress/hdr_mode=0
+compress/bptc_ldr=0
+compress/normal_map=0
+flags/repeat=0
+flags/filter=true
+flags/mipmaps=false
+flags/anisotropic=false
+flags/srgb=2
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/HDR_as_SRGB=false
+process/invert_color=false
+stream=false
+size_limit=0
+detect_3d=true
+svg/scale=1.0
diff --git a/doc/demo07_collision/image/collision-9.JPG b/doc/demo07_collision/image/collision-9.JPG
new file mode 100644
index 0000000..a25300a
Binary files /dev/null and b/doc/demo07_collision/image/collision-9.JPG differ
diff --git a/doc/demo07_collision/image/collision-9.JPG.import b/doc/demo07_collision/image/collision-9.JPG.import
new file mode 100644
index 0000000..20f398b
--- /dev/null
+++ b/doc/demo07_collision/image/collision-9.JPG.import
@@ -0,0 +1,34 @@
+[remap]
+
+importer="texture"
+type="StreamTexture"
+path="res://.import/collision-9.JPG-e1dae7ad681902cbeeb4238adb430b10.stex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://doc/demo07_collision/image/collision-9.JPG"
+dest_files=[ "res://.import/collision-9.JPG-e1dae7ad681902cbeeb4238adb430b10.stex" ]
+
+[params]
+
+compress/mode=0
+compress/lossy_quality=0.7
+compress/hdr_mode=0
+compress/bptc_ldr=0
+compress/normal_map=0
+flags/repeat=0
+flags/filter=true
+flags/mipmaps=false
+flags/anisotropic=false
+flags/srgb=2
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/HDR_as_SRGB=false
+process/invert_color=false
+stream=false
+size_limit=0
+detect_3d=true
+svg/scale=1.0
diff --git a/scene/demo07_collision/collision.tscn b/scene/demo07_collision/collision.tscn
index ee602d5..0f8586c 100644
--- a/scene/demo07_collision/collision.tscn
+++ b/scene/demo07_collision/collision.tscn
@@ -45,7 +45,6 @@ extents = Vector2( 30.17, 29.3458 )
 
 [node name="StaticBody2D" type="StaticBody2D" parent="."]
 position = Vector2( 64.5824, 547.095 )
-collision_layer = 2
 
 [node name="Polygon2D" type="Polygon2D" parent="StaticBody2D"]
 color = Color( 0.329412, 0.580392, 0.270588, 1 )