diff --git a/src/core/login_core/login_core.module.spec.ts b/src/core/login_core/login_core.module.spec.ts
index 2d7fb37..23d2c57 100644
--- a/src/core/login_core/login_core.module.spec.ts
+++ b/src/core/login_core/login_core.module.spec.ts
@@ -1,8 +1,42 @@
+/**
+ * 登录核心模块测试套件
+ * 
+ * 功能描述：
+ * - 测试LoginCoreModule的模块配置和依赖注入
+ * - 验证服务提供者的正确注册和实例化
+ * - 确保JWT配置的正确加载和访问
+ * - 测试模块导出和依赖关系
+ * 
+ * 测试覆盖范围：
+ * - 模块定义：模块实例化和配置验证
+ * - 服务提供者：LoginCoreService和ConfigService的注入
+ * - JWT配置：JWT密钥和过期时间的配置访问
+ * - 模块依赖：依赖模块的正确导入
+ * - 模块导出：服务的正确导出和可用性
+ * 
+ * 测试策略：
+ * - 单元测试：独立测试模块配置
+ * - Mock测试：模拟所有外部依赖服务
+ * - 配置测试：验证配置项的正确读取
+ * 
+ * 依赖模块：
+ * - Jest: 测试框架和Mock功能
+ * - NestJS Testing: 提供测试模块和依赖注入
+ * 
+ * 最近修改：
+ * - 2026-01-15: 代码规范优化 - 清理未使用的导入(UsersService) (修改者: moyin)
+ * - 2026-01-15: 代码规范优化 - 添加文件头注释 (修改者: moyin)
+ * 
+ * @author moyin
+ * @version 1.0.2
+ * @since 2025-12-17
+ * @lastModified 2026-01-15
+ */
+
 import { Test, TestingModule } from '@nestjs/testing';
 import { ConfigService } from '@nestjs/config';
 import { JwtService } from '@nestjs/jwt';
 import { LoginCoreService } from './login_core.service';
-import { UsersService } from '../db/users/users.service';
 import { EmailService } from '../utils/email/email.service';
 import { VerificationService } from '../utils/verification/verification.service';
 
diff --git a/src/core/login_core/login_core.service.ts b/src/core/login_core/login_core.service.ts
index ab9ff21..1f8c10b 100644
--- a/src/core/login_core/login_core.service.ts
+++ b/src/core/login_core/login_core.service.ts
@@ -12,16 +12,16 @@
  * - 为business层提供可复用的服务
  * 
  * 最近修改：
+ * - 2026-01-15: 代码规范优化 - 提取手机号查找为私有方法消除重复代码 (修改者: moyin)
  * - 2026-01-12: 代码规范优化 - 提取魔法数字为常量，拆分过长方法，消除代码重复 (修改者: moyin)
  * - 2026-01-12: 代码规范优化 - 添加LoginCoreService类注释，完善类职责和方法说明 (修改者: moyin)
  * - 2026-01-12: 代码规范优化 - 处理TODO项，移除短信发送相关的TODO注释 (修改者: moyin)
  * - 2025-01-07: 代码规范优化 - 清理未使用的导入(EmailSendResult, crypto)
- * - 2025-01-07: 代码规范优化 - 修复常量命名(saltRounds -> SALT_ROUNDS)
  * 
  * @author moyin
- * @version 1.1.0
+ * @version 1.1.1
  * @since 2025-12-17
- * @lastModified 2026-01-12
+ * @lastModified 2026-01-15
  */
 
 import { Injectable, UnauthorizedException, ConflictException, NotFoundException, BadRequestException, ForbiddenException, Inject } from '@nestjs/common';
@@ -243,8 +243,7 @@ export class LoginCoreService {
 
     // 如果邮箱未找到，尝试手机号查找（简单验证）
     if (!user && this.isPhoneNumber(identifier)) {
-      const users = await this.usersService.findAll();
-      user = users.find((u: Users) => u.phone === identifier) || null;
+      user = await this.findUserByPhone(identifier);
     }
 
     // 用户不存在
@@ -340,9 +339,8 @@ export class LoginCoreService {
 
     // 检查手机号是否已存在
     if (phone) {
-      const users = await this.usersService.findAll();
-      const existingPhone = users.find((u: Users) => u.phone === phone);
-      if (existingPhone) {
+      const phoneExists = await this.isPhoneExists(phone);
+      if (phoneExists) {
         throw new ConflictException('手机号已存在');
       }
     }
@@ -555,8 +553,7 @@ export class LoginCoreService {
         throw new BadRequestException('邮箱未验证，无法重置密码');
       }
     } else if (this.isPhoneNumber(identifier)) {
-      const users = await this.usersService.findAll();
-      user = users.find((u: Users) => u.phone === identifier) || null;
+      user = await this.findUserByPhone(identifier);
     }
 
     if (!user) {
@@ -616,8 +613,7 @@ export class LoginCoreService {
     if (this.isEmail(identifier)) {
       user = await this.usersService.findByEmail(identifier);
     } else if (this.isPhoneNumber(identifier)) {
-      const users = await this.usersService.findAll();
-      user = users.find((u: Users) => u.phone === identifier) || null;
+      user = await this.findUserByPhone(identifier);
     }
 
     if (!user) {
@@ -847,6 +843,30 @@ export class LoginCoreService {
     return phoneRegex.test(str.replace(/\s/g, ''));
   }
 
+  /**
+   * 通过手机号查找用户
+   * 
+   * @param phone 手机号
+   * @returns 用户信息或null
+   * @private
+   */
+  private async findUserByPhone(phone: string): Promise<Users | null> {
+    const users = await this.usersService.findAll();
+    return users.find((u: Users) => u.phone === phone) || null;
+  }
+
+  /**
+   * 检查手机号是否已存在
+   * 
+   * @param phone 手机号
+   * @returns 是否存在
+   * @private
+   */
+  private async isPhoneExists(phone: string): Promise<boolean> {
+    const user = await this.findUserByPhone(phone);
+    return user !== null;
+  }
+
   /**
    * 验证码登录
    * 
@@ -888,8 +908,7 @@ export class LoginCoreService {
       }
     } else if (this.isPhoneNumber(identifier)) {
       // 手机号登录
-      const users = await this.usersService.findAll();
-      user = users.find((u: Users) => u.phone === identifier) || null;
+      user = await this.findUserByPhone(identifier);
       verificationType = VerificationCodeType.SMS_VERIFICATION;
     } else {
       throw new BadRequestException('请提供有效的邮箱或手机号');
@@ -964,8 +983,7 @@ export class LoginCoreService {
         throw new BadRequestException('邮箱未验证，无法使用验证码登录');
       }
     } else if (this.isPhoneNumber(identifier)) {
-      const users = await this.usersService.findAll();
-      user = users.find((u: Users) => u.phone === identifier) || null;
+      user = await this.findUserByPhone(identifier);
       verificationType = VerificationCodeType.SMS_VERIFICATION;
     } else {
       throw new BadRequestException('请提供有效的邮箱或手机号');