diff --git a/controller/groupAgent/chatHistory.ts b/controller/groupAgent/chatHistory.ts
index a1c3e9b..d32a284 100644
--- a/controller/groupAgent/chatHistory.ts
+++ b/controller/groupAgent/chatHistory.ts
@@ -3,6 +3,8 @@ import { LarkEvent } from "@egg/lark-msg-tool"
 import { Lark } from "@egg/net-tool"
 
 import { Context } from "../../types"
+import MapPolyfill from "../../utils/polyfill/map"
+import SetPolyfill from "../../utils/polyfill/set"
 
 interface Message {
   user: string
@@ -63,7 +65,7 @@ const getChatHistory = async (
   }
 ): Promise<{
   messages: Message[]
-  mentions: Map<string, string>
+  mentions: MapPolyfill<string, string>
 }> => {
   // 获取服务器的时区偏移量（以分钟为单位）
   const serverTimezoneOffset = new Date().getTimezoneOffset()
@@ -89,10 +91,10 @@ const getChatHistory = async (
   if (!chatHistory?.length)
     return {
       messages: [],
-      mentions: new Map(),
+      mentions: new MapPolyfill(),
     }
 
-  const targetUsersSet = new Set(
+  const targetUsersSet = new SetPolyfill(
     targetUsers
       ?.filter?.((user) => user.id.user_id)
       ?.map?.((user) => user.id.open_id) ?? []
@@ -100,8 +102,8 @@ const getChatHistory = async (
 
   // 清洗数据
   // 取出所有的被AT的人，以及发送者
-  const mentions: Map<string, string> = new Map()
-  const senders: Set<string> = new Set()
+  const mentions: MapPolyfill<string, string> = new MapPolyfill()
+  const senders: SetPolyfill<string> = new SetPolyfill()
   // 先把提问者加进去
   if (senderOpenId) senders.add(senderOpenId)
   // 过滤出文本和post消息
@@ -159,7 +161,7 @@ const getChatHistory = async (
   }
 
   // 取出没有被AT的发送者
-  const noMentionSenders = new Set(
+  const noMentionSenders = new SetPolyfill(
     [...senders].filter((sender) => !mentions.has(sender))
   )
 
diff --git a/utils/polyfill/map.ts b/utils/polyfill/map.ts
new file mode 100644
index 0000000..01c4d2d
--- /dev/null
+++ b/utils/polyfill/map.ts
@@ -0,0 +1,74 @@
+interface MapPolyfillInterface<K, V> {
+  set(key: K, value: V): void
+  get(key: K): V | undefined
+  delete(key: K): boolean
+  has(key: K): boolean
+  clear(): void
+  forEach(
+    callback: (value: V, key: K, map: MapPolyfill<K, V>) => void,
+    thisArg?: any
+  ): void
+  readonly size: number
+}
+
+class MapPolyfill<K, V> implements MapPolyfillInterface<K, V> {
+  private keys: K[]
+  private values: V[]
+
+  constructor() {
+    this.keys = []
+    this.values = []
+  }
+
+  set(key: K, value: V): void {
+    const index = this.keys.indexOf(key)
+    if (index === -1) {
+      this.keys.push(key)
+      this.values.push(value)
+    } else {
+      this.values[index] = value
+    }
+  }
+
+  get(key: K): V | undefined {
+    const index = this.keys.indexOf(key)
+    if (index === -1) {
+      return undefined
+    }
+    return this.values[index]
+  }
+
+  delete(key: K): boolean {
+    const index = this.keys.indexOf(key)
+    if (index === -1) {
+      return false
+    }
+    this.keys.splice(index, 1)
+    this.values.splice(index, 1)
+    return true
+  }
+
+  has(key: K): boolean {
+    return this.keys.indexOf(key) !== -1
+  }
+
+  clear(): void {
+    this.keys = []
+    this.values = []
+  }
+
+  forEach(
+    callback: (value: V, key: K, map: MapPolyfill<K, V>) => void,
+    thisArg?: any
+  ): void {
+    for (let i = 0; i < this.keys.length; i++) {
+      callback.call(thisArg, this.values[i], this.keys[i], this)
+    }
+  }
+
+  get size(): number {
+    return this.keys.length
+  }
+}
+
+export default MapPolyfill
diff --git a/utils/polyfill/set.ts b/utils/polyfill/set.ts
new file mode 100644
index 0000000..dc113cf
--- /dev/null
+++ b/utils/polyfill/set.ts
@@ -0,0 +1,78 @@
+interface SetPolyfillInterface<T> {
+  add(value: T): void
+  delete(value: T): boolean
+  has(value: T): boolean
+  clear(): void
+  forEach(
+    callback: (value: T, value2: T, set: SetPolyfill<T>) => void,
+    thisArg?: any
+  ): void
+  readonly size: number
+}
+
+class SetPolyfill<T> implements SetPolyfillInterface<T> {
+  private items: Record<string, T>
+
+  constructor(initialValues?: T[]) {
+    this.items = {}
+    if (initialValues) {
+      for (const value of initialValues) {
+        this.add(value)
+      }
+    }
+  }
+
+  add(value: T): void {
+    const key = JSON.stringify(value)
+    this.items[key] = value
+  }
+
+  delete(value: T): boolean {
+    const key = JSON.stringify(value)
+    if (this.has(value)) {
+      delete this.items[key]
+      return true
+    }
+    return false
+  }
+
+  has(value: T): boolean {
+    const key = JSON.stringify(value)
+    return Object.prototype.hasOwnProperty.call(this.items, key)
+  }
+
+  clear(): void {
+    this.items = {}
+  }
+
+  forEach(
+    callback: (value: T, value2: T, set: SetPolyfill<T>) => void,
+    thisArg?: any
+  ): void {
+    for (const key in this.items) {
+      if (Object.prototype.hasOwnProperty.call(this.items, key)) {
+        callback.call(thisArg, this.items[key], this.items[key], this)
+      }
+    }
+  }
+
+  get size(): number {
+    return Object.keys(this.items).length
+  }
+
+  [Symbol.iterator](): Iterator<T> {
+    let index = 0
+    const values = Object.values(this.items)
+    return {
+      next: (): IteratorResult<T> => {
+        if (index < values.length) {
+          return { value: values[index++], done: false }
+        } else {
+          return { value: undefined, done: true }
+        }
+      },
+    }
+  }
+}
+
+export default SetPolyfill