diff --git a/player/player.gd b/player/player.gd
index 66f9316..879fe8a 100644
--- a/player/player.gd
+++ b/player/player.gd
@@ -15,6 +15,13 @@ extends CharacterBody3D
 ## 跳跃输入缓冲帧数（输入事件在渲染帧到达，物理帧读取，避免漏跳）
 const JUMP_BUFFER_FRAMES: int = 6
 
+@export_group("属性")
+## 血量
+@export var health: int = 100:
+	set(value):
+		health = clampi(value, 0, 100)
+		_refresh_health_label()
+
 @export_group("移动")
 ## 常规移动速度（米/秒）
 @export var walk_speed: float = 5.0
@@ -47,9 +54,16 @@ var _pitch: float = 0.0
 var _jump_buffer: int = 0
 ## 本节点是否由本机玩家操控。由世界节点在生成时设置 authority 决定，见 world/main.gd。
 var _is_local: bool = true
+# 血条
+var _health_label: Label = null
 
 
 func _ready() -> void:
+	print("[观察] 我是 %d，这个节点归我管吗？%s，我的名字是 %s"
+		% [multiplayer.get_unique_id(), is_multiplayer_authority(), name])
+	# 生成血条
+	_make_health_label()
+	
 	_is_local = is_multiplayer_authority()
 	if not _is_local:
 		# 远端玩家只是一具「回放身体」：
@@ -82,6 +96,10 @@ func _unhandled_input(event: InputEvent) -> void:
 		set_mouse_captured(Input.mouse_mode != Input.MOUSE_MODE_CAPTURED)
 	elif event is InputEventMouseButton and event.pressed and Input.mouse_mode != Input.MOUSE_MODE_CAPTURED:
 		set_mouse_captured(true)
+	elif event is InputEventKey and event.pressed and not event.echo and event.keycode == KEY_H:
+		# 只有权威端能改被同步的属性，别人改的会被覆盖回去
+		if is_multiplayer_authority():
+			health -= 10
 
 
 func set_mouse_captured(captured: bool) -> void:
@@ -129,3 +147,18 @@ func _physics_process(delta: float) -> void:
 	velocity.z = horizontal.y
 
 	move_and_slide()
+
+func _make_health_label() -> void:
+	var layer := CanvasLayer.new()
+	_health_label = Label.new()
+	_health_label.position = Vector2(16, 56)
+	layer.add_child(_health_label)
+	add_child(layer)
+	_refresh_health_label()
+
+
+func _refresh_health_label() -> void:
+	# 远端玩家没有血条，_health_label 是 null，这里直接跳过
+	if _health_label == null:
+		return
+	_health_label.text = "HP %d / 100" % health
diff --git a/player/player.tscn b/player/player.tscn
index 9c2c0a1..4eac4dc 100644
--- a/player/player.tscn
+++ b/player/player.tscn
@@ -1,7 +1,7 @@
 [gd_scene format=3 uid="uid://bekuuw153mv03"]
 
 [ext_resource type="Script" uid="uid://f5ptp3is4agf" path="res://player/player.gd" id="1_oul6g"]
-[ext_resource type="SceneReplicationConfig" path="res://player/player_sync.tres" id="2_rkbax"]
+[ext_resource type="SceneReplicationConfig" uid="uid://c4ubbxjfrrs47" path="res://player/player_sync.tres" id="2_rkbax"]
 
 [sub_resource type="CapsuleShape3D" id="CapsuleShape3D_rkbax"]
 radius = 0.4
@@ -18,6 +18,16 @@ roughness = 0.6
 
 [node name="Player" type="CharacterBody3D" unique_id=869687860]
 script = ExtResource("1_oul6g")
+health = null
+walk_speed = null
+sprint_speed = null
+acceleration = null
+air_acceleration = null
+jump_velocity = null
+turn_speed = null
+mouse_sensitivity = null
+pitch_min_deg = null
+pitch_max_deg = null
 
 [node name="Collision" type="CollisionShape3D" parent="." unique_id=215132582]
 transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0.9, 0)
diff --git a/player/player_sync.tres b/player/player_sync.tres
index c217763..ca29b8d 100644
--- a/player/player_sync.tres
+++ b/player/player_sync.tres
@@ -1,4 +1,4 @@
-[gd_resource type="SceneReplicationConfig" format=3]
+[gd_resource type="SceneReplicationConfig" format=3 uid="uid://c4ubbxjfrrs47"]
 
 [resource]
 properties/0/path = NodePath(".:position")
@@ -7,3 +7,6 @@ properties/0/replication_mode = 1
 properties/1/path = NodePath("Body:rotation")
 properties/1/spawn = true
 properties/1/replication_mode = 1
+properties/2/path = NodePath(".:health")
+properties/2/spawn = true
+properties/2/replication_mode = 1