diff --git a/Assets/Tests/EditMode/Combat.meta b/Assets/Tests/EditMode/Combat.meta
new file mode 100644
index 00000000..525b8828
--- /dev/null
+++ b/Assets/Tests/EditMode/Combat.meta
@@ -0,0 +1,8 @@
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diff --git a/Assets/Tests/EditMode/Combat/HurtBoxMultiplierTests.cs b/Assets/Tests/EditMode/Combat/HurtBoxMultiplierTests.cs
new file mode 100644
index 00000000..259c5c54
--- /dev/null
+++ b/Assets/Tests/EditMode/Combat/HurtBoxMultiplierTests.cs
@@ -0,0 +1,77 @@
+using NUnit.Framework;
+using UnityEngine;
+using UnityEngine.TestTools;
+using BaseGames.Combat;
+
+namespace BaseGames.Tests.EditMode.Combat
+{
+    public class HurtBoxMultiplierTests
+    {
+        /// <summary>测试期建出的宿主对象；在 TearDown 统一销毁，断言失败也不会残留到编辑器场景。</summary>
+        private GameObject _host;
+
+        [SetUp]
+        public void SetUp() => LogAssert.ignoreFailingMessages = true;
+
+        [TearDown]
+        public void TearDown()
+        {
+            // 项目关闭了 Domain/Scene Reload：断言失败会跳过用例后续语句，
+            // 清理必须放在 TearDown，否则失败一次就往编辑器场景里漏一个对象。
+            if (_host != null) Object.DestroyImmediate(_host);
+            _host = null;
+            LogAssert.ignoreFailingMessages = false;
+        }
+
+        /// <summary>
+        /// HurtBox 标了 [RequireComponent(typeof(Collider2D))]，而 Collider2D 是抽象类，
+        /// Unity 无法自动补齐——裸 AddComponent&lt;HurtBox&gt;() 会返回真 null。
+        /// 必须先挂一个具体碰撞体。
+        /// </summary>
+        private HurtBox CreateHurtBox()
+        {
+            _host = new GameObject("hurtbox");
+            _host.AddComponent<BoxCollider2D>();
+            var hb = _host.AddComponent<HurtBox>();
+            Assert.IsNotNull(hb, "HurtBox 需要先有具体 Collider2D 才能挂载");
+            return hb;
+        }
+
+        [Test]
+        public void DefaultMultiplier_IsOne()
+        {
+            var hb = CreateHurtBox();
+            Assert.AreEqual(1f, hb.DamageMultiplier);
+        }
+
+        [Test]
+        public void SetDamageMultiplier_ClampsToNonNegative()
+        {
+            var hb = CreateHurtBox();
+
+            hb.SetDamageMultiplier(2.5f);
+            Assert.AreEqual(2.5f, hb.DamageMultiplier);
+
+            hb.SetDamageMultiplier(-3f);
+            Assert.AreEqual(0f, hb.DamageMultiplier, "负倍率无意义，钳到 0");
+        }
+
+        [Test]
+        public void ApplyMultiplier_ScalesRawAmount_AndFloorsAtOne()
+        {
+            var hb = CreateHurtBox();
+
+            hb.SetDamageMultiplier(2f);
+            Assert.AreEqual(20, hb.ApplyDamageMultiplier(10));
+
+            hb.SetDamageMultiplier(0f);
+            Assert.AreEqual(1, hb.ApplyDamageMultiplier(10), "倍率 0 也至少造成 1 点，与防御减免同规则");
+
+            hb.SetDamageMultiplier(1f);
+            Assert.AreEqual(10, hb.ApplyDamageMultiplier(10), "倍率 1 时数值原样通过");
+            // 倍率 1 必须是"原样通过"，而不是"乘完再钳最低 1"：10 在两种实现下都得 10，
+            // 只有 0 能把二者区分开。这条断言守住"默认倍率不改变任何既有伤害数值"。
+            Assert.AreEqual(0, hb.ApplyDamageMultiplier(0), "倍率 1 时原样通过，不引入最低 1 的钳制");
+        }
+    }
+}
diff --git a/Assets/Tests/EditMode/Combat/HurtBoxMultiplierTests.cs.meta b/Assets/Tests/EditMode/Combat/HurtBoxMultiplierTests.cs.meta
new file mode 100644
index 00000000..745164e5
--- /dev/null
+++ b/Assets/Tests/EditMode/Combat/HurtBoxMultiplierTests.cs.meta
@@ -0,0 +1,11 @@
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diff --git a/Assets/_Game/Scripts/Combat/HurtBox.cs b/Assets/_Game/Scripts/Combat/HurtBox.cs
index 72dd7fa4..8b0e9b58 100644
--- a/Assets/_Game/Scripts/Combat/HurtBox.cs
+++ b/Assets/_Game/Scripts/Combat/HurtBox.cs
@@ -4,7 +4,7 @@ using BaseGames.Parry;
 namespace BaseGames.Combat
 {
     /// <summary>
-    /// 受击盒组件。实现完整 8 步伤害流水线（架构 06_CombatModule §5）。
+    /// 受击盒组件。实现完整 9 步伤害流水线（架构 06_CombatModule §5）。
     /// 挂载在角色根节点或指定子节点上，Collider2D 需设 IsTrigger = true，
     /// Layer = PlayerHurtBox 或 EnemyHurtBox。
     /// </summary>
@@ -33,6 +33,28 @@ namespace BaseGames.Combat
         public void SetPoiseSource(IPoiseSource src)      => _poiseSource  = src;
         public void SetInvincible(bool value)             => _isHurtBoxInvincible = value;
         public void SetActive(bool value)                 => _isActive     = value;
+
+        // 本 HurtBox 专属的受击倍率（弱点部位 > 1；默认 1 = 无影响）。
+        // 由能力在弱点窗口期间开关，语义与"这个部位更脆弱"一致。
+        private float _damageMultiplier = 1f;
+
+        /// <summary>本 HurtBox 当前的受击伤害倍率。</summary>
+        public float DamageMultiplier => _damageMultiplier;
+
+        /// <summary>设置受击倍率（弱点窗口开合时调用）。负值钳到 0。</summary>
+        public void SetDamageMultiplier(float value)
+            => _damageMultiplier = UnityEngine.Mathf.Max(0f, value);
+
+        /// <summary>
+        /// 按本 HurtBox 的倍率缩放伤害。最低 1 点，与防御减免同规则
+        /// （倍率为 0 也不该让攻击完全无效——那属于无敌帧的语义，不是弱点倍率的）。
+        /// 倍率为 1 时原样返回，保证默认状态下伤害数值与未引入倍率前完全一致。
+        /// </summary>
+        public int ApplyDamageMultiplier(int raw)
+            => _damageMultiplier == 1f
+                ? raw
+                : UnityEngine.Mathf.Max(1, UnityEngine.Mathf.RoundToInt(raw * _damageMultiplier));
+
 #if UNITY_EDITOR
         // 付给编辑器的只读属性——避免反射并限制编辑器与运行时字段名耐合性。
         public object EditorOwner           => _owner;
@@ -109,15 +131,18 @@ namespace BaseGames.Combat
                 info.Amount = passThrough;
             }
 
-            // 5. 计算 FinalDamage（防御减免，最低 1）
+            // 5. 本 HurtBox 受击倍率（弱点部位；默认 1 时无影响）
+            info.Amount = ApplyDamageMultiplier(info.Amount);
+
+            // 6. 计算 FinalDamage（防御减免，最低 1）
             int finalDamage  = UnityEngine.Mathf.Max(1, info.Amount - _owner.Defense);
             info.Amount      = finalDamage;
             info.FinalDamage = finalDamage;
 
-            // 6. 调用 _owner.TakeDamage
+            // 7. 调用 _owner.TakeDamage
             _owner.TakeDamage(info);
 
-            // 7. 全局广播
+            // 8. 全局广播
             _onDamageDealt?.Raise(info);
             _onHitConfirmed?.Raise(new HitInfo
             {
@@ -125,7 +150,7 @@ namespace BaseGames.Combat
                 HitPoint   = resolvedHitPoint,
             });
 
-            // 8. 状态效果触发（DoT — Fire / Poison）
+            // 9. 状态效果触发（DoT — Fire / Poison）
             // _statusEffectable 已在 Awake 中缓存，无需每次受击调用 GetComponent
             _statusEffectable?.ApplyStatusEffect(info.Type);
         }