diff --git a/src/main/wcdb4-client.ts b/src/main/wcdb4-client.ts
index 2b0c5d4..89d2abb 100644
--- a/src/main/wcdb4-client.ts
+++ b/src/main/wcdb4-client.ts
@@ -58,6 +58,17 @@ export interface Wcdb4GroupMember {
   m_nsHeadImgUrl: string
 }
 
+/**
+ * 联系人表中独立保存的成员名称字段。
+ *
+ * 群成员接口的 nickname 在部分微信数据版本中会被通讯录备注覆盖，因此不能用它
+ * 推断微信昵称或备注。
+ */
+type Wcdb4ContactMemberNames = {
+  wechatNickname: string
+  remark: string
+}
+
 export interface Wcdb4ImageHardlink {
   file_name?: string
   full_path?: string
@@ -1684,76 +1695,16 @@ export class Wcdb4Client {
       const rows = this.callJson<Record<string, unknown>[]>((handle, outJson) =>
         this.wcdbGetGroupMembers!(handle, chatroomId, outJson)
       )
-
-      const members = (Array.isArray(rows) ? rows : []).map((row) => {
-        const username = this.pickString(row, [
-          'username',
-          'userName',
-          'user_name',
-          'member_username',
-          'm_nsUsrName'
-        ])
-        const wechatNickname = this.pickString(row, [
-          'nickname',
-          'nickName',
-          'wechatNickname',
-          'wechat_nickname',
-          'm_nsNickName'
-        ])
-        const remark = this.pickString(row, [
-          'remark',
-          'remarkName',
-          'remark_name',
-          'contactRemark',
-          'contact_remark'
-        ])
-        const rowGroupNickname = this.pickString(row, [
-          'groupNickname',
-          'group_nickname',
-          'displayName',
-          'display_name'
-        ])
-        const memberNickname = this.pickString(row, ['name'])
-        const avatar = this.pickString(row, [
-          'avatarUrl',
-          'avatar_url',
-          'headImgUrl',
-          'm_nsHeadImgUrl'
-        ])
-
-        if (username) {
-          if (avatar) this.avatarCache.set(username, avatar)
-        }
-
-        return {
-          m_nsUsrName: username,
-          nickname: wechatNickname || memberNickname || remark || rowGroupNickname,
-          groupNickname: groupNicknames.get(username) || rowGroupNickname,
-          wechatNickname: wechatNickname || memberNickname,
-          remark,
-          m_nsHeadImgUrl: avatar
-        }
-      })
-
-      const missingDisplayNames = members
-        .filter((member) => !member.nickname)
-        .map((member) => member.m_nsUsrName)
-        .filter(Boolean)
-      this.hydrateDisplayNames(missingDisplayNames)
+      const memberRows = Array.isArray(rows) ? rows : []
+      const contactNames = this.readContactMemberNames(this.groupMemberUsernames(memberRows))
+      const members = this.normalizeGroupMembers(memberRows, groupNicknames, contactNames)
       this.hydrateAvatarUrls(
         members
           .filter((member) => !member.m_nsHeadImgUrl)
           .map((member) => member.m_nsUsrName)
           .filter(Boolean)
       )
-      return members.map((member) => ({
-        ...member,
-        nickname:
-          member.nickname || this.displayNameCache.get(member.m_nsUsrName) || member.m_nsUsrName,
-        wechatNickname:
-          member.wechatNickname || this.displayNameCache.get(member.m_nsUsrName) || '',
-        m_nsHeadImgUrl: member.m_nsHeadImgUrl || this.avatarCache.get(member.m_nsUsrName) || ''
-      }))
+      return this.withCachedGroupMemberAvatars(members)
     } catch {
       return []
     }
@@ -1827,76 +1778,98 @@ export class Wcdb4Client {
         this.wcdbGetGroupMembers as unknown as KoffiAsyncFunction,
         chatroomId
       )
-      const members = (Array.isArray(rows) ? rows : []).map((row) => {
-        const username = this.pickString(row, [
+      const memberRows = Array.isArray(rows) ? rows : []
+      const contactNames = await this.readContactMemberNamesAsync(
+        this.groupMemberUsernames(memberRows)
+      )
+      const members = this.normalizeGroupMembers(memberRows, groupNicknames, contactNames)
+      const missingAvatars = members
+        .filter((member) => !member.m_nsHeadImgUrl)
+        .map((member) => member.m_nsUsrName)
+        .filter(Boolean)
+      await this.hydrateAvatarUrlsAsync(missingAvatars)
+      return this.withCachedGroupMemberAvatars(members)
+    } catch (error) {
+      console.warn(`[WCDB4] async group members failed chatroom=${chatroomId}:`, error)
+      return []
+    }
+  }
+
+  /**
+   * 将群成员接口与联系人表组装为语义明确的成员快照。
+   *
+   * 群昵称只接受群聊数据；微信昵称与通讯录备注只接受 contact 表。即使群成员
+   * 接口返回了 nickname，也不能作为名称字段的回退，以免把通讯录备注误展示为微信昵称。
+   */
+  private normalizeGroupMembers(
+    rows: Record<string, unknown>[],
+    groupNicknames: Map<string, string>,
+    contactNames: Map<string, Wcdb4ContactMemberNames>
+  ): Wcdb4GroupMember[] {
+    return rows.map((row) => {
+      const username = this.pickString(row, [
+        'username',
+        'userName',
+        'user_name',
+        'member_username',
+        'm_nsUsrName'
+      ])
+      const rowGroupNickname = this.pickString(row, [
+        'groupNickname',
+        'group_nickname',
+        'displayName',
+        'display_name'
+      ])
+      const groupNickname = groupNicknames.get(username) || rowGroupNickname
+      const contact = contactNames.get(username)
+      const wechatNickname = contact?.wechatNickname || ''
+      const remark = contact?.remark || ''
+      const avatar = this.pickString(row, [
+        'avatarUrl',
+        'avatar_url',
+        'headImgUrl',
+        'm_nsHeadImgUrl'
+      ])
+
+      if (username && avatar) this.avatarCache.set(username, avatar)
+
+      return {
+        m_nsUsrName: username,
+        // nickname 是旧调用方使用的通用显示字段，保持安全的名称优先级。
+        nickname: wechatNickname || groupNickname || username,
+        groupNickname,
+        wechatNickname,
+        remark,
+        m_nsHeadImgUrl: avatar
+      }
+    })
+  }
+
+  /**
+   * 从原始群成员行提取联系人查询键，避免把空值传进 SQL IN 条件。
+   */
+  private groupMemberUsernames(rows: Record<string, unknown>[]): string[] {
+    return rows
+      .map((row) =>
+        this.pickString(row, [
           'username',
           'userName',
           'user_name',
           'member_username',
           'm_nsUsrName'
         ])
-        const wechatNickname = this.pickString(row, [
-          'nickname',
-          'nickName',
-          'wechatNickname',
-          'wechat_nickname',
-          'm_nsNickName'
-        ])
-        const remark = this.pickString(row, [
-          'remark',
-          'remarkName',
-          'remark_name',
-          'contactRemark',
-          'contact_remark'
-        ])
-        const rowGroupNickname = this.pickString(row, [
-          'groupNickname',
-          'group_nickname',
-          'displayName',
-          'display_name'
-        ])
-        const memberNickname = this.pickString(row, ['name'])
-        const avatar = this.pickString(row, [
-          'avatarUrl',
-          'avatar_url',
-          'headImgUrl',
-          'm_nsHeadImgUrl'
-        ])
-        if (username && avatar) this.avatarCache.set(username, avatar)
-        return {
-          m_nsUsrName: username,
-          nickname: wechatNickname || memberNickname || remark || rowGroupNickname,
-          groupNickname: groupNicknames.get(username) || rowGroupNickname,
-          wechatNickname: wechatNickname || memberNickname,
-          remark,
-          m_nsHeadImgUrl: avatar
-        }
-      })
+      )
+      .filter(Boolean)
+  }
 
-      const missingNames = members
-        .filter((member) => !member.nickname)
-        .map((member) => member.m_nsUsrName)
-        .filter(Boolean)
-      const missingAvatars = members
-        .filter((member) => !member.m_nsHeadImgUrl)
-        .map((member) => member.m_nsUsrName)
-        .filter(Boolean)
-      await Promise.all([
-        this.hydrateDisplayNamesAsync(missingNames),
-        this.hydrateAvatarUrlsAsync(missingAvatars)
-      ])
-      return members.map((member) => ({
-        ...member,
-        nickname:
-          member.nickname || this.displayNameCache.get(member.m_nsUsrName) || member.m_nsUsrName,
-        wechatNickname:
-          member.wechatNickname || this.displayNameCache.get(member.m_nsUsrName) || '',
-        m_nsHeadImgUrl: member.m_nsHeadImgUrl || this.avatarCache.get(member.m_nsUsrName) || ''
-      }))
-    } catch (error) {
-      console.warn(`[WCDB4] async group members failed chatroom=${chatroomId}:`, error)
-      return []
-    }
+  /**
+   * 为已标准化的成员补充头像缓存，不参与名称字段的回退。
+   */
+  private withCachedGroupMemberAvatars(members: Wcdb4GroupMember[]): Wcdb4GroupMember[] {
+    return members.map((member) => ({
+      ...member,
+      m_nsHeadImgUrl: member.m_nsHeadImgUrl || this.avatarCache.get(member.m_nsUsrName) || ''
+    }))
   }
 
   getGroupNicknames(chatroomId: string): Map<string, string> {
@@ -2667,27 +2640,6 @@ export class Wcdb4Client {
     return false
   }
 
-  private hydrateDisplayNames(usernames: string[]): void {
-    if (!this.wcdbGetDisplayNames) return
-    const missing = this.uniq(usernames).filter((username) => !this.displayNameCache.has(username))
-    if (missing.length === 0) return
-
-    try {
-      const rows = this.callJson<Record<string, string> | Record<string, unknown>[]>(
-        (handle, outJson) => this.wcdbGetDisplayNames!(handle, JSON.stringify(missing), outJson)
-      )
-      this.readStringMap(rows, [
-        'nickname',
-        'displayName',
-        'display_name',
-        'remark',
-        'name'
-      ]).forEach((name, username) => this.displayNameCache.set(username, name))
-    } catch {
-      // Names are optional; usernames are still enough to load chats.
-    }
-  }
-
   private async hydrateDisplayNamesAsync(usernames: string[]): Promise<void> {
     if (!this.wcdbGetDisplayNames) return
     const missing = this.uniq(usernames).filter((username) => !this.displayNameCache.has(username))
@@ -2793,6 +2745,85 @@ export class Wcdb4Client {
     }
   }
 
+  /**
+   * 从 contact 表读取群成员的微信昵称与通讯录备注。
+   *
+   * 查询失败时返回空映射：群成员快照仍可用，并由调用方回退到群昵称或 wxid；
+   * 不得使用群成员接口的 nickname，因为该字段可能实际保存的是通讯录备注。
+   */
+  private readContactMemberNames(usernames: string[]): Map<string, Wcdb4ContactMemberNames> {
+    const result = new Map<string, Wcdb4ContactMemberNames>()
+    if (!this.wcdbExecQuery || usernames.length === 0) return result
+
+    const inList = this.uniq(usernames)
+      .map((username) => `'${username.replace(/'/g, "''")}'`)
+      .join(',')
+    if (!inList) return result
+
+    try {
+      const rows = this.callJson<Record<string, unknown>[]>((handle, outJson) =>
+        this.wcdbExecQuery!(
+          handle,
+          'contact',
+          '',
+          `SELECT username, nick_name, remark FROM contact WHERE username IN (${inList})`,
+          outJson
+        )
+      )
+      return this.contactMemberNamesFromRows(rows)
+    } catch {
+      return result
+    }
+  }
+
+  /**
+   * 异步读取 contact 表的成员名称字段，语义与同步路径保持一致。
+   */
+  private async readContactMemberNamesAsync(
+    usernames: string[]
+  ): Promise<Map<string, Wcdb4ContactMemberNames>> {
+    const result = new Map<string, Wcdb4ContactMemberNames>()
+    if (!this.wcdbExecQuery || usernames.length === 0) return result
+
+    const inList = this.uniq(usernames)
+      .map((username) => `'${username.replace(/'/g, "''")}'`)
+      .join(',')
+    if (!inList) return result
+
+    try {
+      const rows = await this.callJsonAsync<Record<string, unknown>[]>(
+        this.wcdbExecQuery as unknown as KoffiAsyncFunction,
+        'contact',
+        '',
+        `SELECT username, nick_name, remark FROM contact WHERE username IN (${inList})`
+      )
+      return this.contactMemberNamesFromRows(rows)
+    } catch {
+      return result
+    }
+  }
+
+  /**
+   * 将 contact 查询行转换为按 wxid 索引的名称映射。
+   */
+  private contactMemberNamesFromRows(
+    rows: Record<string, unknown>[]
+  ): Map<string, Wcdb4ContactMemberNames> {
+    const result = new Map<string, Wcdb4ContactMemberNames>()
+    if (!Array.isArray(rows)) return result
+
+    for (const row of rows) {
+      const username = this.pickString(row, ['username', 'user_name', 'userName', 'm_nsUsrName'])
+      if (!username) continue
+      result.set(username, {
+        wechatNickname: this.pickString(row, ['nick_name', 'nickName', 'm_nsNickName']),
+        remark: this.pickString(row, ['remark', 'remark_name', 'remarkName'])
+      })
+    }
+
+    return result
+  }
+
   private readContactAvatarUrls(usernames: string[]): Map<string, string> {
     const result = new Map<string, string>()
     if (!this.wcdbExecQuery || usernames.length === 0) return result
diff --git a/tests/unit/wcdb-group-members.test.ts b/tests/unit/wcdb-group-members.test.ts
new file mode 100644
index 0000000..57f55b9
--- /dev/null
+++ b/tests/unit/wcdb-group-members.test.ts
@@ -0,0 +1,113 @@
+import { describe, expect, it, vi } from 'vitest'
+import { Wcdb4Client } from '../../src/main/wcdb4-client'
+
+const groupMemberRows = [
+  {
+    username: 'wxid-member',
+    // 某些微信数据版本会在这个字段返回通讯录备注，不能作为微信昵称使用。
+    nickname: '被污染的接口备注',
+    groupNickname: '行内群昵称',
+    avatarUrl: 'https://example.com/member.jpg'
+  }
+]
+
+const contactRows = [
+  {
+    username: 'wxid-member',
+    nick_name: '真实微信昵称',
+    remark: '真实通讯录备注'
+  }
+]
+
+function expectedMember(overrides: Partial<Record<string, string>> = {}) {
+  return {
+    m_nsUsrName: 'wxid-member',
+    nickname: '真实微信昵称',
+    groupNickname: '真实群昵称',
+    wechatNickname: '真实微信昵称',
+    remark: '真实通讯录备注',
+    m_nsHeadImgUrl: 'https://example.com/member.jpg',
+    ...overrides
+  }
+}
+
+describe('WCDB group member names', () => {
+  it('uses contact nick_name and remark instead of the ambiguous synchronous member nickname', () => {
+    const getGroupMembers = vi.fn(() => 0)
+    const executeQuery = vi.fn(() => 0)
+    const callJson = vi.fn((call: (handle: number, output: [null]) => number) => {
+      const queryCount = executeQuery.mock.calls.length
+      call(1, [null])
+      return executeQuery.mock.calls.length > queryCount ? contactRows : groupMemberRows
+    })
+    const client = Object.assign(Object.create(Wcdb4Client.prototype), {
+      wcdbGetGroupMembers: getGroupMembers,
+      wcdbExecQuery: executeQuery,
+      callJson,
+      getGroupNicknames: vi.fn(() => new Map([['wxid-member', '真实群昵称']])),
+      avatarCache: new Map<string, string>(),
+      wcdbGetAvatarUrls: null
+    }) as Wcdb4Client
+
+    expect(client.getGroupMembers('fixture@chatroom')).toEqual([expectedMember()])
+    expect(executeQuery).toHaveBeenCalledWith(
+      1,
+      'contact',
+      '',
+      expect.stringContaining('SELECT username, nick_name, remark FROM contact'),
+      expect.any(Array)
+    )
+  })
+
+  it('uses the same independent contact fields in the asynchronous snapshot path', async () => {
+    const getGroupMembers = vi.fn()
+    const executeQuery = vi.fn()
+    const callJsonAsync = vi.fn(async (fn: unknown) => {
+      if (fn === getGroupMembers) return groupMemberRows
+      if (fn === executeQuery) return contactRows
+      throw new Error('unexpected native query')
+    })
+    const client = Object.assign(Object.create(Wcdb4Client.prototype), {
+      wcdbGetGroupMembers: getGroupMembers,
+      wcdbExecQuery: executeQuery,
+      callJsonAsync,
+      getGroupNicknamesAsync: vi.fn(async () => new Map([['wxid-member', '真实群昵称']])),
+      avatarCache: new Map<string, string>(),
+      wcdbGetAvatarUrls: null
+    }) as Wcdb4Client
+
+    await expect(client.getGroupMembersAsync('fixture@chatroom')).resolves.toEqual([
+      expectedMember()
+    ])
+    expect(callJsonAsync).toHaveBeenLastCalledWith(
+      executeQuery,
+      'contact',
+      '',
+      expect.stringContaining('SELECT username, nick_name, remark FROM contact')
+    )
+  })
+
+  it('falls back to the group nickname without leaking an ambiguous member nickname', () => {
+    const getGroupMembers = vi.fn(() => 0)
+    const executeQuery = vi.fn(() => 0)
+    const callJson = vi.fn((call: (handle: number, output: [null]) => number) => {
+      const queryCount = executeQuery.mock.calls.length
+      call(1, [null])
+      if (executeQuery.mock.calls.length > queryCount)
+        throw new Error('contact database unavailable')
+      return groupMemberRows
+    })
+    const client = Object.assign(Object.create(Wcdb4Client.prototype), {
+      wcdbGetGroupMembers: getGroupMembers,
+      wcdbExecQuery: executeQuery,
+      callJson,
+      getGroupNicknames: vi.fn(() => new Map([['wxid-member', '真实群昵称']])),
+      avatarCache: new Map<string, string>(),
+      wcdbGetAvatarUrls: null
+    }) as Wcdb4Client
+
+    expect(client.getGroupMembers('fixture@chatroom')).toEqual([
+      expectedMember({ nickname: '真实群昵称', wechatNickname: '', remark: '' })
+    ])
+  })
+})