diff --git a/src/core/state/impl/ObservableImpl.ts b/src/core/state/impl/ObservableImpl.ts
index 1728b34..c309a70 100644
--- a/src/core/state/impl/ObservableImpl.ts
+++ b/src/core/state/impl/ObservableImpl.ts
@@ -176,7 +176,7 @@ export class ObservableImpl<T extends TNonFunctionProperties<T>> implements IObs
     this.notifyScheduled = false
 
     // 全量订阅 —— 每个订阅单独 try/catch，避免一个错误阻塞其它订阅
-    for (const fn of Array.from(this.listeners)) {
+    for (const fn of this.listeners) {
       try {
         fn(this.state as unknown as T)
       } catch (err) {
@@ -188,11 +188,11 @@ export class ObservableImpl<T extends TNonFunctionProperties<T>> implements IObs
     }
 
     // 字段订阅：把同一个回调的多个 key 聚合到一次调用里
-    const fnMap: Map<TObservableKeyListener<T, keyof T>, (keyof T)[]> = new Map()
+    const fnMap: Map<TObservableKeyListener<T, keyof T>, Array<keyof T>> = new Map()
     for (const key of keys) {
       const set = this.keyListeners.get(key)
       if (!set) continue
-      for (const fn of Array.from(set)) {
+      for (const fn of set) {
         const existing = fnMap.get(fn)
         if (existing === undefined) {
           fnMap.set(fn, [key])
@@ -212,7 +212,7 @@ export class ObservableImpl<T extends TNonFunctionProperties<T>> implements IObs
           result[k] = (this.state as Record<keyof T, unknown>)[k] as T[(typeof k) & keyof T]
         })
         // 调用时类型上兼容 TObservableKeyListener<T, K>，因为我们传的是对应 key 的 Pick
-        fn(result as unknown as any) // 最后一处转换仅为满足 TypeScript 调用签名（不引入 any 到实现变量）
+        fn(result as Pick<T, (typeof subKeys)[number]>)
       } catch (err) {
         // eslint-disable-next-line no-console
         console.error("Observable keyListener error:", err)
@@ -296,6 +296,7 @@ export class ObservableImpl<T extends TNonFunctionProperties<T>> implements IObs
     this.keyListeners.clear()
     this.pendingKeys.clear()
     this.proxyCache = new WeakMap()
+    Object.freeze(this.state)
   }
 
   /** 语法糖：返回一个可解构赋值的 Proxy */