diff --git a/data/balance.json b/data/balance.json
index faea819..e844399 100644
--- a/data/balance.json
+++ b/data/balance.json
@@ -11,5 +11,6 @@
   },
   "aether_thresholds": [[1, 0], [5, 3], [10, 8], [15, 14], [20, 20]],
   "mana_heat": { "per_cast": 0.01, "decay_per_sec": 0.1, "max": 1.0 },
-  "infinite_spells": { "hp_per_shot": 1.0, "hp_cost_cap_ratio": 0.15 }
+  "infinite_spells": { "hp_per_shot": 1.0, "hp_cost_cap_ratio": 0.15 },
+  "player_iframe_sec": 0.5
 }
diff --git a/scripts/autoloads/settings_manager.gd b/scripts/autoloads/settings_manager.gd
index 6b1c587..3001fd2 100644
--- a/scripts/autoloads/settings_manager.gd
+++ b/scripts/autoloads/settings_manager.gd
@@ -36,6 +36,7 @@ var _BOSS_HP: Dictionary = {}  # 原型→基础血量
 var _AETHER_THRESHOLDS: Array = []   # [[到达波次, 碎片], ...] 升序
 var _MANA_HEAT: Dictionary = {"per_cast": 0.01, "decay_per_sec": 0.1, "max": 1.0}
 var _INFINITE: Dictionary = {"hp_per_shot": 1.0, "hp_cost_cap_ratio": 0.15}
+var _IFRAME_SEC: float = 0.5   # 玩家受击无敌窗口（秒）；balance.json player_iframe_sec
 
 const BALANCE_JSON: String = "res://data/balance.json"
 
@@ -68,6 +69,7 @@ func mana_heat_decay() -> float:      return float(_MANA_HEAT.get("decay_per_sec
 func mana_heat_max() -> float:        return float(_MANA_HEAT.get("max", 1.0))
 func infinite_hp_per_shot() -> float: return float(_INFINITE.get("hp_per_shot", 1.0))
 func hp_cost_cap_ratio() -> float:    return float(_INFINITE.get("hp_cost_cap_ratio", 0.15))
+func player_iframe_sec() -> float:    return _IFRAME_SEC
 
 ## 数据驱动：加载 balance.json（难度乘子 + Boss 血量）
 func _load_balance() -> void:
@@ -91,6 +93,8 @@ func _load_balance() -> void:
 	if data.has("infinite_spells") and data["infinite_spells"] is Dictionary:
 		for k in data["infinite_spells"]:
 			_INFINITE[k] = data["infinite_spells"][k]
+	if data.has("player_iframe_sec"):
+		_IFRAME_SEC = float(data["player_iframe_sec"])
 
 func difficulty_name() -> String:
 	return ["DIFF_BEGINNER", "DIFF_STANDARD", "DIFF_CHALLENGE"][difficulty]