diff --git a/doc/demo_camera/camera.md b/doc/demo_camera/camera.md
index f4a3b91..bd033cd 100644
--- a/doc/demo_camera/camera.md
+++ b/doc/demo_camera/camera.md
@@ -1,6 +1,29 @@
+# camera
 ![Image text](image/camera1.png)
 ![Image text](image/camera2.png)
 ![Image text](image/camera3.png)
 ![Image text](image/camera4.png)
 ![Image text](image/camera5.png)
 ![Image text](image/camera6.png)
+
+
+
+# viewport(视口，可视化窗口)
+- root就是根节点的viewport
+  ![Image text](image/viewport1.png)
+  ![Image text](image/viewport2.png)
+  ![Image text](image/viewport3.png)
+  ![Image text](image/viewport4.png)
+  ![Image text](image/viewport5.png)
+  ![Image text](image/viewport6.png)
+  ![Image text](image/viewport7.png)
+  ![Image text](image/viewport8.png)
+  ![Image text](image/viewport9.png)
+  ![Image text](image/viewport10.png)
+  ![Image text](image/viewport11.png)
+
+# canvas layer
+-  它是一个节点, 为所有子代和孙代添加一个单独的2D渲染层.Viewport的子节点默认在图层 "0 " 处绘制, 而CanvasLayer将在任何数字层处绘制.
+- 数字较大的图层将绘制在数字较小的图层之上.CanvasLayers也有自己的变换, 不依赖于其他层的变换. 这使得当我们对游戏世界的观察发生变化时,UI可以固定在屏幕空间中.
+
+![Image text](image/canvaslayers.png)
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index 0000000..908a0d8
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+++ b/doc/demo_gui/image/viewport2.png.import
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+path="res://.import/viewport2.png-1d943d7f5c24ab4e99c366c03d9f6fe6.stex"
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+}
+
+[deps]
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+dest_files=[ "res://.import/viewport2.png-1d943d7f5c24ab4e99c366c03d9f6fe6.stex" ]
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diff --git a/doc/demo_gui/image/viewport3.png.import b/doc/demo_gui/image/viewport3.png.import
new file mode 100644
index 0000000..fc1f893
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+++ b/doc/demo_gui/image/viewport3.png.import
@@ -0,0 +1,34 @@
+[remap]
+
+importer="texture"
+type="StreamTexture"
+path="res://.import/viewport3.png-734f55dc82cb802d6dfe631a520b9a5d.stex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://doc/demo_gui/image/viewport3.png"
+dest_files=[ "res://.import/viewport3.png-734f55dc82cb802d6dfe631a520b9a5d.stex" ]
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+[params]
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+compress/mode=0
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+flags/repeat=0
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+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/demo_gui/image/viewport4.png.import b/doc/demo_gui/image/viewport4.png.import
new file mode 100644
index 0000000..1cf8f3c
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+++ b/doc/demo_gui/image/viewport4.png.import
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+[remap]
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+importer="texture"
+type="StreamTexture"
+path="res://.import/viewport4.png-793038a9881e92975602c6e8f009c1da.stex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://doc/demo_gui/image/viewport4.png"
+dest_files=[ "res://.import/viewport4.png-793038a9881e92975602c6e8f009c1da.stex" ]
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+[params]
+
+compress/mode=0
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+compress/hdr_mode=0
+compress/bptc_ldr=0
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+flags/repeat=0
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+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
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diff --git a/doc/demo_gui/image/viewport5.png.import b/doc/demo_gui/image/viewport5.png.import
new file mode 100644
index 0000000..a795735
--- /dev/null
+++ b/doc/demo_gui/image/viewport5.png.import
@@ -0,0 +1,34 @@
+[remap]
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+importer="texture"
+type="StreamTexture"
+path="res://.import/viewport5.png-209a34e806cc86df0b59a2c59ac44ee8.stex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://doc/demo_gui/image/viewport5.png"
+dest_files=[ "res://.import/viewport5.png-209a34e806cc86df0b59a2c59ac44ee8.stex" ]
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+[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
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diff --git a/doc/demo_gui/image/viewport6.png.import b/doc/demo_gui/image/viewport6.png.import
new file mode 100644
index 0000000..44d7631
--- /dev/null
+++ b/doc/demo_gui/image/viewport6.png.import
@@ -0,0 +1,34 @@
+[remap]
+
+importer="texture"
+type="StreamTexture"
+path="res://.import/viewport6.png-8e5f250bab17c6959fafe5fbf685d527.stex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://doc/demo_gui/image/viewport6.png"
+dest_files=[ "res://.import/viewport6.png-8e5f250bab17c6959fafe5fbf685d527.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/demo_gui/image/viewport7.png.import b/doc/demo_gui/image/viewport7.png.import
new file mode 100644
index 0000000..0b0131f
--- /dev/null
+++ b/doc/demo_gui/image/viewport7.png.import
@@ -0,0 +1,34 @@
+[remap]
+
+importer="texture"
+type="StreamTexture"
+path="res://.import/viewport7.png-aea8ac19413279de1f8e0b54de68447a.stex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://doc/demo_gui/image/viewport7.png"
+dest_files=[ "res://.import/viewport7.png-aea8ac19413279de1f8e0b54de68447a.stex" ]
+
+[params]
+
+compress/mode=0
+compress/lossy_quality=0.7
+compress/hdr_mode=0
+compress/bptc_ldr=0
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+flags/repeat=0
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+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
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diff --git a/doc/demo_gui/image/viewport8.png.import b/doc/demo_gui/image/viewport8.png.import
new file mode 100644
index 0000000..e531179
--- /dev/null
+++ b/doc/demo_gui/image/viewport8.png.import
@@ -0,0 +1,34 @@
+[remap]
+
+importer="texture"
+type="StreamTexture"
+path="res://.import/viewport8.png-aae2778e89c12eaf5a5109f83547bd78.stex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://doc/demo_gui/image/viewport8.png"
+dest_files=[ "res://.import/viewport8.png-aae2778e89c12eaf5a5109f83547bd78.stex" ]
+
+[params]
+
+compress/mode=0
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+flags/srgb=2
+process/fix_alpha_border=true
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diff --git a/doc/demo_gui/image/viewport9.png.import b/doc/demo_gui/image/viewport9.png.import
new file mode 100644
index 0000000..ca04e92
--- /dev/null
+++ b/doc/demo_gui/image/viewport9.png.import
@@ -0,0 +1,34 @@
+[remap]
+
+importer="texture"
+type="StreamTexture"
+path="res://.import/viewport9.png-1e42fb4fb94a46e7f1aeaa2948895441.stex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://doc/demo_gui/image/viewport9.png"
+dest_files=[ "res://.import/viewport9.png-1e42fb4fb94a46e7f1aeaa2948895441.stex" ]
+
+[params]
+
+compress/mode=0
+compress/lossy_quality=0.7
+compress/hdr_mode=0
+compress/bptc_ldr=0
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+flags/anisotropic=false
+flags/srgb=2
+process/fix_alpha_border=true
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diff --git a/scene/demo_camera/mini.tscn b/scene/demo_camera/mini.tscn
new file mode 100644
index 0000000..09081f8
--- /dev/null
+++ b/scene/demo_camera/mini.tscn
@@ -0,0 +1,14 @@
+[gd_scene load_steps=3 format=2]
+
+[ext_resource path="res://scene/demo_camera/move_camera.tscn" type="PackedScene" id=1]
+[ext_resource path="res://scene/demo_camera/mini_viewport.tscn" type="PackedScene" id=2]
+
+[node name="Node2D" type="Node2D"]
+
+[node name="Node2D" parent="." instance=ExtResource( 1 )]
+
+[node name="CanvasLayer" type="CanvasLayer" parent="."]
+
+[node name="Control" parent="CanvasLayer" instance=ExtResource( 2 )]
+margin_right = 0.0
+margin_bottom = 0.0
diff --git a/scene/demo_camera/mini_viewport.tscn b/scene/demo_camera/mini_viewport.tscn
new file mode 100644
index 0000000..0688d5f
--- /dev/null
+++ b/scene/demo_camera/mini_viewport.tscn
@@ -0,0 +1,30 @@
+[gd_scene load_steps=2 format=2]
+
+[ext_resource path="res://scene/demo_camera/move_camera.tscn" type="PackedScene" id=1]
+
+[node name="Control" type="Control"]
+anchor_right = 1.0
+anchor_bottom = 1.0
+margin_right = -1024.0
+margin_bottom = -600.0
+__meta__ = {
+"_edit_use_anchors_": false
+}
+
+[node name="ViewportContainer" type="ViewportContainer" parent="."]
+margin_left = 773.127
+margin_top = 444.248
+margin_right = 1023.13
+margin_bottom = 594.248
+__meta__ = {
+"_edit_use_anchors_": false
+}
+
+[node name="Viewport" type="Viewport" parent="ViewportContainer"]
+size = Vector2( 250, 150 )
+handle_input_locally = false
+render_target_update_mode = 3
+
+[node name="Camera2D" type="Camera2D" parent="ViewportContainer/Viewport"]
+
+[node name="Node2D" parent="ViewportContainer/Viewport" instance=ExtResource( 1 )]
diff --git a/scene/demo_camera/simple_viewport.tscn b/scene/demo_camera/simple_viewport.tscn
new file mode 100644
index 0000000..5dc0084
--- /dev/null
+++ b/scene/demo_camera/simple_viewport.tscn
@@ -0,0 +1,38 @@
+[gd_scene load_steps=3 format=2]
+
+[ext_resource path="res://script/demo_camera/player.gd" type="Script" id=1]
+[ext_resource path="res://icon.png" type="Texture" id=2]
+
+[node name="Node2D" type="Node2D"]
+
+[node name="icon" type="Sprite" parent="."]
+position = Vector2( 73.0152, 64.7613 )
+texture = ExtResource( 2 )
+
+[node name="Control" type="Control" parent="."]
+margin_left = 1.0
+margin_right = 1024.0
+margin_bottom = 601.0
+__meta__ = {
+"_edit_use_anchors_": false
+}
+
+[node name="ViewportContainer" type="ViewportContainer" parent="Control"]
+modulate = Color( 0.0352941, 0.894118, 0.65098, 1 )
+margin_left = 770.879
+margin_top = 437.506
+margin_right = 1020.88
+margin_bottom = 587.506
+__meta__ = {
+"_edit_use_anchors_": false
+}
+
+[node name="Viewport" type="Viewport" parent="Control/ViewportContainer"]
+size = Vector2( 250, 150 )
+handle_input_locally = false
+render_target_update_mode = 3
+
+[node name="Sprite" type="Sprite" parent="Control/ViewportContainer/Viewport"]
+position = Vector2( 100, 100 )
+texture = ExtResource( 2 )
+script = ExtResource( 1 )
diff --git a/scene/demo_test/demo_test.tscn b/scene/demo_test/demo_test.tscn
index c2e723d..a7a625b 100644
--- a/scene/demo_test/demo_test.tscn
+++ b/scene/demo_test/demo_test.tscn
@@ -9,3 +9,5 @@ script = ExtResource( 1 )
 [node name="icon" type="Sprite" parent="."]
 position = Vector2( 958.772, 540.059 )
 texture = ExtResource( 2 )
+
+[node name="Node2D" type="Node2D" parent="."]