diff --git a/package.json b/package.json
index 83edfc7..706be5e 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "wechatexplorer",
-  "version": "1.0.1",
+  "version": "1.0.2",
   "description": "mac 版本获取微信聊天记录, AI群聊总结助手",
   "keywords": [
     "wechat",
diff --git a/src/main/index.ts b/src/main/index.ts
index fe74269..adfb143 100644
--- a/src/main/index.ts
+++ b/src/main/index.ts
@@ -161,14 +161,12 @@ app.whenReady().then(() => {
 
       return {
         id: msg.mesLocalID || Math.random().toString(),
-        from: msg.mesDes === '1' ? 'user' : 'assistant', // 1 通常是接收到的，0 是发送的？需要验证。Swift 说：[1: "user", 0: "assistant"]
+        from: msg.mesDes === 1 ? 'user' : 'assistant', // 1 通常是接收到的，0 是发送的？需要验证。Swift 说：[1: "user", 0: "assistant"]
         type: MSG_TYPE_DICT[msgType] || msg.messageType,
         datetime: date.toLocaleString('zh-CN', { hour12: false }),
         content: content,
-        isSender: msg.mesDes === '0',
         img: img,
         name: name
-        // 实际上让我们坚持我们观察到的：1=用户(其他人), 0=助手(我)
       }
     })
   })
diff --git a/src/main/wechat-db.ts b/src/main/wechat-db.ts
index 7b67597..cee1ece 100644
--- a/src/main/wechat-db.ts
+++ b/src/main/wechat-db.ts
@@ -13,7 +13,7 @@ export interface UserContact {
 
 export interface WechatMessage {
   mesLocalID: string
-  mesDes: string
+  mesDes: number
   messageType: string
   msgCreateTime: string
   msgContent: string
diff --git a/src/renderer/src/components/ChatWindow.tsx b/src/renderer/src/components/ChatWindow.tsx
index 3681faa..e605bc9 100644
--- a/src/renderer/src/components/ChatWindow.tsx
+++ b/src/renderer/src/components/ChatWindow.tsx
@@ -39,6 +39,7 @@ const ChatWindow: React.FC<ChatWindowProps> = ({
   onRefresh,
   onRefreshData
 }) => {
+  const isGroupChat = contact?.type === 'group' || contact?.m_nsUsrName?.endsWith('@chatroom')
   const messagesEndRef = useRef<HTMLDivElement>(null)
   const imageContainerRef = useRef<HTMLDivElement>(null)
   const [generatedImage, setGeneratedImage] = useState<string | null>(null)
@@ -115,11 +116,16 @@ const ChatWindow: React.FC<ChatWindowProps> = ({
           // 昨天
           const startOfYesterday = startOfDay - 86400000
           return parsed >= startOfYesterday && parsed < startOfDay
-        } else {
+        } else if (days === 7) {
           // 过去 7 天
           const startOf7DaysAgo = startOfDay - 7 * 86400000
           return parsed >= startOf7DaysAgo
+        } else if (days === 30) {
+          // 过去 30 天
+          const startOf30DaysAgo = startOfDay - 30 * 86400000
+          return parsed >= startOf30DaysAgo
         }
+        return true
       })
     }
 
@@ -127,7 +133,15 @@ const ChatWindow: React.FC<ChatWindowProps> = ({
     const csvContent = [
       headers.join(','),
       ...filtered.map((m) => {
-        const content = m.content.replace(/"/g, '""').replace(/\n/g, ' ')
+        let prefix = ''
+        if (isGroupChat) {
+          prefix = m.name ? `${m.name}: ` : ''
+        } else {
+          const name = m.from === 'user' ? contact?.m_nsNickName || '未知' : '我'
+          prefix = `${name}: `
+        }
+        const fullContent = `${prefix}${m.content}`
+        const content = fullContent.replace(/"/g, '""').replace(/\n/g, ' ')
         return `"${m.from}","${m.type}","${m.datetime}","${content}"`
       })
     ].join('\n')
@@ -300,7 +314,12 @@ const ChatWindow: React.FC<ChatWindowProps> = ({
                       display: !showAvatar ? 'flex' : 'block'
                     }}
                   >
-                    {msg.name && <div style={{ fontSize: 18 }}>{msg.name}: </div>}
+                    {(msg.name || contact.m_nsNickName) && (
+                      <div style={{ display: 'flex', fontSize: 18 }}>
+                        {isGroupChat ? msg.name : msg.from === 'user' ? contact.m_nsNickName : '我'}
+                        <span>{isGroupChat ? (msg.name ? ':' : '') : ':'} </span>
+                      </div>
+                    )}
                     <div
                       style={{
                         fontSize: 18,
@@ -367,6 +386,9 @@ const ChatWindow: React.FC<ChatWindowProps> = ({
         <button className="toolbar-btn" onClick={() => handleExport(7)}>
           📅 导出近7天
         </button>
+        <button className="toolbar-btn" onClick={() => handleExport(30)}>
+          📅 导出近30天
+        </button>
         <button className="toolbar-btn" onClick={() => setShowSettingsModal(true)}>
           🤖 AI总结群聊
         </button>