diff --git a/assets/fonts/AlibabaPuHuiTi-3-65-Medium.ttf b/assets/fonts/AlibabaPuHuiTi-3-65-Medium.ttf
new file mode 100644
index 0000000..38ee60f
Binary files /dev/null and b/assets/fonts/AlibabaPuHuiTi-3-65-Medium.ttf differ
diff --git a/assets/fonts/AlibabaPuHuiTi-3-65-Medium.ttf.import b/assets/fonts/AlibabaPuHuiTi-3-65-Medium.ttf.import
new file mode 100644
index 0000000..5cad574
--- /dev/null
+++ b/assets/fonts/AlibabaPuHuiTi-3-65-Medium.ttf.import
@@ -0,0 +1,36 @@
+[remap]
+
+importer="font_data_dynamic"
+type="FontFile"
+uid="uid://c2bipf4tpdjj8"
+path="res://.godot/imported/AlibabaPuHuiTi-3-65-Medium.ttf-9a6e0f84d96a7d41f689a2173ac531c4.fontdata"
+
+[deps]
+
+source_file="res://assets/fonts/AlibabaPuHuiTi-3-65-Medium.ttf"
+dest_files=["res://.godot/imported/AlibabaPuHuiTi-3-65-Medium.ttf-9a6e0f84d96a7d41f689a2173ac531c4.fontdata"]
+
+[params]
+
+Rendering=null
+antialiasing=1
+generate_mipmaps=false
+disable_embedded_bitmaps=true
+multichannel_signed_distance_field=false
+msdf_pixel_range=8
+msdf_size=48
+allow_system_fallback=true
+force_autohinter=false
+modulate_color_glyphs=false
+hinting=1
+subpixel_positioning=4
+keep_rounding_remainders=true
+oversampling=0.0
+Fallbacks=null
+fallbacks=[]
+Compress=null
+compress=true
+preload=[]
+language_support={}
+script_support={}
+opentype_features={}
diff --git a/project.godot b/project.godot
index a339c99..194649f 100644
--- a/project.godot
+++ b/project.godot
@@ -11,9 +11,14 @@ config_version=5
 [application]
 
 config/name="PaperChemisGame"
+run/main_scene="uid://b2rokrdsjgx62"
 config/features=PackedStringArray("4.5", "GL Compatibility")
 config/icon="res://icon.svg"
 
+[autoload]
+
+MultiGame="*res://scripts/autoload/MultiGame.gd"
+
 [rendering]
 
 renderer/rendering_method="gl_compatibility"
diff --git a/scenes/main_menu.tscn b/scenes/main_menu.tscn
index 789201b..6e34dcd 100644
--- a/scenes/main_menu.tscn
+++ b/scenes/main_menu.tscn
@@ -1,3 +1,145 @@
-[gd_scene format=3 uid="uid://b2rokrdsjgx62"]
+[gd_scene load_steps=5 format=3 uid="uid://b2rokrdsjgx62"]
+
+[ext_resource type="Script" uid="uid://bnieej0tc51ei" path="res://scripts/main_menu/main_menu.gd" id="1_ekxnf"]
+[ext_resource type="FontFile" uid="uid://c2bipf4tpdjj8" path="res://assets/fonts/AlibabaPuHuiTi-3-65-Medium.ttf" id="1_l6cm7"]
+[ext_resource type="Script" uid="uid://dxekqwgtgqkg" path="res://scripts/main_menu/create_game_ui.gd" id="3_bqqt6"]
+[ext_resource type="Script" uid="uid://cosrsj5i8s26q" path="res://scripts/main_menu/join_game_ui.gd" id="4_wu84c"]
 
 [node name="MainMenu" type="Node2D"]
+script = ExtResource("1_ekxnf")
+
+[node name="Background" type="ColorRect" parent="."]
+offset_left = -21.0
+offset_top = -15.0
+offset_right = 1186.0
+offset_bottom = 654.0
+color = Color(0.7058824, 0.6862745, 0, 1)
+
+[node name="Title" type="Label" parent="."]
+offset_left = 304.0
+offset_top = 58.0
+offset_right = 883.0
+offset_bottom = 177.0
+size_flags_horizontal = 4
+theme_override_fonts/font = ExtResource("1_l6cm7")
+theme_override_font_sizes/font_size = 84
+text = "纸片化学社区版"
+horizontal_alignment = 1
+
+[node name="StartGame" type="Button" parent="."]
+offset_left = 397.0
+offset_top = 227.0
+offset_right = 713.03845
+offset_bottom = 326.0
+theme_override_fonts/font = ExtResource("1_l6cm7")
+theme_override_font_sizes/font_size = 36
+text = "创建局域网游戏"
+
+[node name="JoinGame" type="Button" parent="."]
+offset_left = 396.0
+offset_top = 373.0
+offset_right = 712.03845
+offset_bottom = 472.0
+theme_override_fonts/font = ExtResource("1_l6cm7")
+theme_override_font_sizes/font_size = 36
+text = "加入局域网游戏"
+
+[node name="CreateGameUI" type="Node2D" parent="."]
+visible = false
+position = Vector2(316, 203)
+script = ExtResource("3_bqqt6")
+
+[node name="Background" type="ColorRect" parent="CreateGameUI"]
+offset_right = 475.0
+offset_bottom = 257.0
+color = Color(0, 0.7372549, 0, 1)
+
+[node name="CreateGameEdit" type="LineEdit" parent="CreateGameUI"]
+offset_left = 65.0
+offset_top = 26.0
+offset_right = 392.0
+offset_bottom = 87.0
+
+[node name="CreateGameButton" type="Button" parent="CreateGameUI"]
+offset_left = 128.0
+offset_top = 127.0
+offset_right = 330.81818
+offset_bottom = 224.0
+theme_override_fonts/font = ExtResource("1_l6cm7")
+theme_override_font_sizes/font_size = 36
+text = "创建房间"
+
+[node name="Label" type="Label" parent="CreateGameUI"]
+offset_left = 131.0
+offset_top = 88.0
+offset_right = 326.0
+offset_bottom = 126.0
+theme_override_fonts/font = ExtResource("1_l6cm7")
+text = "请输入最大玩家数（2～4）"
+
+[node name="Warn" type="Node2D" parent="CreateGameUI"]
+visible = false
+
+[node name="WarnBackground" type="ColorRect" parent="CreateGameUI/Warn"]
+offset_left = 86.0
+offset_top = 41.0
+offset_right = 366.0
+offset_bottom = 202.0
+color = Color(1, 0.3137255, 1, 1)
+
+[node name="WarnButton" type="Button" parent="CreateGameUI/Warn"]
+offset_left = 167.0
+offset_top = 125.0
+offset_right = 279.0
+offset_bottom = 188.0
+text = "确定"
+
+[node name="WarnLabel" type="Label" parent="CreateGameUI/Warn"]
+offset_left = 126.0
+offset_top = 64.0
+offset_right = 316.0
+offset_bottom = 107.0
+theme_override_fonts/font = ExtResource("1_l6cm7")
+text = "输入数据错误！
+请输入2～4之间的整数！"
+horizontal_alignment = 1
+
+[node name="JoinGameUI" type="Node2D" parent="."]
+visible = false
+position = Vector2(328, 216)
+script = ExtResource("4_wu84c")
+metadata/_edit_group_ = true
+
+[node name="Background" type="ColorRect" parent="JoinGameUI"]
+offset_right = 475.0
+offset_bottom = 257.0
+color = Color(0, 0.7372549, 0, 1)
+
+[node name="JoinGameEdit" type="LineEdit" parent="JoinGameUI"]
+offset_left = 65.0
+offset_top = 26.0
+offset_right = 392.0
+offset_bottom = 87.0
+
+[node name="JoinGameButton" type="Button" parent="JoinGameUI"]
+offset_left = 128.0
+offset_top = 127.0
+offset_right = 330.81818
+offset_bottom = 224.0
+theme_override_fonts/font = ExtResource("1_l6cm7")
+theme_override_font_sizes/font_size = 36
+text = "加入房间"
+
+[node name="Label" type="Label" parent="JoinGameUI"]
+offset_left = 131.0
+offset_top = 88.0
+offset_right = 326.0
+offset_bottom = 126.0
+theme_override_fonts/font = ExtResource("1_l6cm7")
+text = "请输入服务器IP（无需加端口）"
+
+[connection signal="pressed" from="StartGame" to="." method="_on_start_game_pressed"]
+[connection signal="pressed" from="JoinGame" to="." method="_on_join_game_pressed"]
+[connection signal="pressed" from="CreateGameUI/CreateGameButton" to="CreateGameUI" method="_on_create_game_button_pressed"]
+[connection signal="pressed" from="CreateGameUI/Warn/WarnButton" to="CreateGameUI" method="_on_warn_button_pressed"]
+[connection signal="pressed" from="JoinGameUI/JoinGameButton" to="JoinGameUI" method="_on_join_game_button_pressed"]
diff --git a/scripts/autoload/MultiGame.gd b/scripts/autoload/MultiGame.gd
new file mode 100644
index 0000000..4cef584
--- /dev/null
+++ b/scripts/autoload/MultiGame.gd
@@ -0,0 +1,11 @@
+extends Node
+
+func create_server(player_num: int) -> void:
+	var peer = ENetMultiplayerPeer.new()
+	peer.create_server(8989, player_num)
+	multiplayer.multiplayer_peer = peer
+
+func create_client(ip: String) -> void:
+	var peer = ENetMultiplayerPeer.new()
+	peer.create_client(ip, 8989)
+	multiplayer.multiplayer_peer = peer
\ No newline at end of file
diff --git a/scripts/autoload/MultiGame.gd.uid b/scripts/autoload/MultiGame.gd.uid
new file mode 100644
index 0000000..2a42f7c
--- /dev/null
+++ b/scripts/autoload/MultiGame.gd.uid
@@ -0,0 +1 @@
+uid://dwbuaieufg51g
diff --git a/scripts/main_menu/create_game_ui.gd b/scripts/main_menu/create_game_ui.gd
new file mode 100644
index 0000000..4ebe31e
--- /dev/null
+++ b/scripts/main_menu/create_game_ui.gd
@@ -0,0 +1,14 @@
+extends Node2D
+
+
+func _on_create_game_button_pressed() -> void:
+	var player_num = int($CreateGameEdit.text)
+	if 2 <= player_num and player_num <= 4:
+		MultiGame.create_server(int(player_num))
+		$".".hide()
+	else:
+		$Warn.show()
+
+
+func _on_warn_button_pressed() -> void:
+	$Warn.hide()
diff --git a/scripts/main_menu/create_game_ui.gd.uid b/scripts/main_menu/create_game_ui.gd.uid
new file mode 100644
index 0000000..78b88f3
--- /dev/null
+++ b/scripts/main_menu/create_game_ui.gd.uid
@@ -0,0 +1 @@
+uid://dxekqwgtgqkg
diff --git a/scripts/main_menu/join_game_ui.gd b/scripts/main_menu/join_game_ui.gd
new file mode 100644
index 0000000..9062d22
--- /dev/null
+++ b/scripts/main_menu/join_game_ui.gd
@@ -0,0 +1,7 @@
+extends Node2D
+
+
+func _on_join_game_button_pressed() -> void:
+	var ip: String = $JoinGameEdit.text
+	MultiGame.create_client(ip)
+	$".".hide()
diff --git a/scripts/main_menu/join_game_ui.gd.uid b/scripts/main_menu/join_game_ui.gd.uid
new file mode 100644
index 0000000..a3313ee
--- /dev/null
+++ b/scripts/main_menu/join_game_ui.gd.uid
@@ -0,0 +1 @@
+uid://cosrsj5i8s26q
diff --git a/scripts/main_menu/main_menu.gd b/scripts/main_menu/main_menu.gd
new file mode 100644
index 0000000..078fd36
--- /dev/null
+++ b/scripts/main_menu/main_menu.gd
@@ -0,0 +1,8 @@
+extends Node2D
+
+
+func _on_join_game_pressed() -> void:
+	$JoinGameUI.show()
+
+func _on_start_game_pressed() -> void:
+	$CreateGameUI.show()
diff --git a/scripts/main_menu/main_menu.gd.uid b/scripts/main_menu/main_menu.gd.uid
new file mode 100644
index 0000000..8025f96
--- /dev/null
+++ b/scripts/main_menu/main_menu.gd.uid
@@ -0,0 +1 @@
+uid://bnieej0tc51ei