diff --git a/apps/bym.js b/apps/bym.js
index bbe0bd71..c066b056 100644
--- a/apps/bym.js
+++ b/apps/bym.js
@@ -2,7 +2,8 @@ import { Config } from '../utils/config.js'
 import { getChatHistoryGroup } from '../utils/chat.js'
 import { convertFaces } from '../utils/face.js'
 import { customSplitRegex, filterResponseChunk } from '../utils/text.js'
-import core from '../model/core.js'
+import core, {roleMap} from '../model/core.js'
+import {formatDate} from '../utils/common.js'
 
 export class bym extends plugin {
   constructor () {
@@ -54,13 +55,13 @@ export class bym extends plugin {
     }
     if (prop < Config.bymRate) {
       logger.info('random chat hit')
-      let chats = await getChatHistoryGroup(e, 20)
+      let chats = await getChatHistoryGroup(e, Config.groupContextLength)
       let system = `你的名字是“${Config.assistantLabel}”，你在一个qq群里，群号是${group},当前和你说话的人群名片是${card}, qq号是${sender}, 请你结合用户的发言和聊天记录作出回应，要求表现得随性一点，最好参与讨论，混入其中。不要过分插科打诨，不知道说什么可以复读群友的话。要求你做搜索、发图、发视频和音乐等操作时要使用工具。不可以直接发[图片]这样蒙混过关。要求优先使用中文进行对话。如果此时不需要自己说话，可以只回复<EMPTY>` +
         candidate +
         '以下是聊天记录:' + chats
           .map(chat => {
             let sender = chat.sender || chat || {}
-            return `${sender.card || sender.nickname}(${sender.user_id}) ：${chat.raw_message}`
+            return `【${sender.card || sender.nickname}】(qq：${sender.user_id}, ${roleMap[sender.role] || 'normal user'}，${sender.area ? 'from ' + sender.area + ', ' : ''} ${sender.age} years old, 群头衔：${sender.title}, gender: ${sender.sex}, time：${formatDate(new Date(chat.time * 1000))} 说：${chat.raw_message}`
           })
           .join('\n') +
         `\n你的回复应该尽可能简练，像人类一样随意，不要附加任何奇怪的东西，如聊天记录的格式（比如${Config.assistantLabel}：），禁止重复聊天记录。`
diff --git a/model/core.js b/model/core.js
index 2d906f10..e8af1a45 100644
--- a/model/core.js
+++ b/model/core.js
@@ -55,7 +55,7 @@ import { BingAIClient } from '../client/CopilotAIClient.js'
 import Keyv from 'keyv'
 import crypto from 'crypto'
 
-const roleMap = {
+export const roleMap = {
   owner: 'group owner',
   admin: 'group administrator'
 }
diff --git a/utils/chat.js b/utils/chat.js
index 28a2187c..1d860388 100644
--- a/utils/chat.js
+++ b/utils/chat.js
@@ -16,13 +16,13 @@ export async function getChatHistoryGroup (e, num) {
         if (!chatHistory || chatHistory.length === 0) {
           break
         }
-        chats.push(...chatHistory)
-        if (seq === chatHistory[0].seq || seq === chatHistory[0].message_id) {
+        chats.push(...chatHistory.reverse())
+        if (seq === chatHistory[chatHistory.length - 1].seq || seq === chatHistory[chatHistory.length - 1].message_id) {
           break
         }
-        seq = chatHistory[0].seq || chatHistory[0].message_id
+        seq = chatHistory[chatHistory.length - 1].seq || chatHistory[chatHistory.length - 1].message_id
       }
-      chats = chats.slice(0, num)
+      chats = chats.slice(0, num).reverse()
       try {
         let mm = await e.bot.gml
         for (const chat of chats) {