diff --git a/autoloads/global.gd b/autoloads/global.gd
index 533ec33..c167777 100644
--- a/autoloads/global.gd
+++ b/autoloads/global.gd
@@ -1,13 +1,15 @@
 extends Node
 
+const FLASH_MATERIAL = preload("uid://cwtrdmkrsmw23")
 
 var player: Player
 
-# Called when the node enters the scene tree for the first time.
-func _ready() -> void:
-	pass # Replace with function body.
-
-
-# Called every frame. 'delta' is the elapsed time since the previous frame.
-func _process(delta: float) -> void:
-	pass
+# 尝试阻止敌人攻击，获取闪避， unit_stats block_chance 越大
+# 成功率越高
+func get_chance_success(chance: float) -> bool:
+	var random := randf_range(0, 1.0)
+	
+	if random < chance:
+		return true
+		
+	return false
diff --git a/effect/flash.gdshader b/effect/flash.gdshader
new file mode 100644
index 0000000..20a2e5a
--- /dev/null
+++ b/effect/flash.gdshader
@@ -0,0 +1,6 @@
+shader_type canvas_item;
+
+void fragment() {
+	COLOR = vec4(1.0,1.0,1.0,texture(TEXTURE, UV).a);
+	
+}
diff --git a/effect/flash.gdshader.uid b/effect/flash.gdshader.uid
new file mode 100644
index 0000000..a0262b2
--- /dev/null
+++ b/effect/flash.gdshader.uid
@@ -0,0 +1 @@
+uid://dmnmstd7ptupl
diff --git a/effect/flash_material.tres b/effect/flash_material.tres
new file mode 100644
index 0000000..e2a26c5
--- /dev/null
+++ b/effect/flash_material.tres
@@ -0,0 +1,6 @@
+[gd_resource type="ShaderMaterial" format=3 uid="uid://cwtrdmkrsmw23"]
+
+[ext_resource type="Shader" uid="uid://dmnmstd7ptupl" path="res://effect/flash.gdshader" id="1_dhio8"]
+
+[resource]
+shader = ExtResource("1_dhio8")
diff --git a/scenes/unit/enemy/enemy.gd b/scenes/unit/enemy/enemy.gd
index 6f49c7d..5c8d4e3 100644
--- a/scenes/unit/enemy/enemy.gd
+++ b/scenes/unit/enemy/enemy.gd
@@ -10,7 +10,7 @@ var can_move := true
 
 # Called when the node enters the scene tree for the first time.
 func _ready() -> void:
-	pass # Replace with function body.
+	super._ready()
 
 
 # Called every frame. 'delta' is the elapsed time since the previous frame.
diff --git a/scenes/unit/unit.gd b/scenes/unit/unit.gd
index c3284d6..812d5ab 100644
--- a/scenes/unit/unit.gd
+++ b/scenes/unit/unit.gd
@@ -7,15 +7,30 @@ class_name Unit
 @onready var sprite: Sprite2D = %Sprite
 @onready var anim_player: AnimationPlayer = $AnimationPlayer
 @onready var health_component: HealthComponent = $HealthComponent
+@onready var flash_timer: Timer = $FlashTimer
 
 func _ready() -> void:
-	print(stats)
 	health_component.setup(stats)
 
+func set_flash_material() -> void:
+	sprite.material = Global.FLASH_MATERIAL
+	flash_timer.start()
 
 func _on_hurtbox_component_on_damaged(hitbox: HitboxComponent) -> void:
 	if health_component.current_health <=0:
 		return
 	
+	var blocked := Global.get_chance_success(stats.block_chance / 100)
+	
+	if blocked:
+		print("Blocked!")
+		return
+		
+	set_flash_material()
+	
 	health_component.take_damage(hitbox.damage)
 	print("%s: %d" % [name, health_component.current_health] )
+
+
+func _on_flash_timer_timeout() -> void:
+	sprite.material = null
diff --git a/scenes/unit/unit.tscn b/scenes/unit/unit.tscn
index 90734e9..6f6fed6 100644
--- a/scenes/unit/unit.tscn
+++ b/scenes/unit/unit.tscn
@@ -258,5 +258,10 @@ offset_top = -90.0
 offset_right = 50.0
 offset_bottom = -70.0
 
+[node name="FlashTimer" type="Timer" parent="." unique_id=2034069027]
+wait_time = 0.2
+one_shot = true
+
 [connection signal="on_damaged" from="HurtboxComponent" to="." method="_on_hurtbox_component_on_damaged"]
 [connection signal="on_health_changed" from="HealthComponent" to="HealthBar" method="_on_health_component_on_health_changed"]
+[connection signal="timeout" from="FlashTimer" to="." method="_on_flash_timer_timeout"]