diff --git a/packages/application/auth/password_handler.py b/packages/application/auth/password_handler.py
new file mode 100644
index 000000000..2bd2da363
--- /dev/null
+++ b/packages/application/auth/password_handler.py
@@ -0,0 +1,126 @@
+"""
+密码处理器委托层
+
+此模块作为 Domain 层 (packages.domain.auth.password_hasher) 和 Application 层之间的委托层，
+隔离 Domain 层对 bcrypt 库的直接依赖。
+
+使用方式：
+    from packages.application.auth.password_handler import PasswordHandler, get_password_handler
+    
+    password_handler = PasswordHandler()
+    hashed = password_handler.hash_password("my_secure_password")
+    is_valid = password_handler.verify_password("my_secure_password", hashed)
+"""
+
+from typing import Optional, Tuple
+
+from packages.domain.auth.password_hasher import PasswordHasher, PasswordValidator
+
+
+class PasswordHandler:
+    """
+    密码处理器委托类
+    
+    委托给 packages.domain.auth.password_hasher 进行实际的密码哈希操作，
+    此层仅负责配置和封装，不直接依赖 bcrypt 库。
+    """
+
+    def __init__(self, rounds: int = 12):
+        """
+        初始化密码处理器
+        
+        Args:
+            rounds: bcrypt cost factor（默认 12，推荐范围 10-14）
+        """
+        self._hasher = PasswordHasher(rounds=rounds)
+        self._validator = PasswordValidator(
+            min_length=8,
+            require_uppercase=True,
+            require_lowercase=True,
+            require_digit=True,
+            require_special=False,
+        )
+
+    def hash_password(self, password: str) -> str:
+        """
+        哈希密码
+        
+        Args:
+            password: 明文密码
+            
+        Returns:
+            bcrypt 哈希字符串
+            
+        Raises:
+            ValueError: 密码为空
+        """
+        return self._hasher.hash_password(password)
+
+    def verify_password(self, password: str, hashed_password: str) -> bool:
+        """
+        验证密码
+        
+        Args:
+            password: 明文密码
+            hashed_password: 存储的哈希密码
+            
+        Returns:
+            True 如果密码正确，否则 False
+        """
+        return self._hasher.verify_password(password, hashed_password)
+
+    def needs_rehash(self, hashed_password: str) -> bool:
+        """
+        检查哈希是否需要重新计算
+        
+        Args:
+            hashed_password: 存储的哈希密码
+            
+        Returns:
+            True 如果需要重新哈希
+        """
+        return self._hasher.needs_rehash(hashed_password)
+
+    def validate_strength(self, password: str) -> Tuple[bool, Optional[str]]:
+        """
+        验证密码强度
+        
+        Args:
+            password: 明文密码
+            
+        Returns:
+            (是否有效, 错误信息)
+        """
+        return self._validator.validate(password)
+
+
+# 默认处理器实例
+_default_handler: Optional[PasswordHandler] = None
+
+
+def configure_password_handler(rounds: int = 12) -> PasswordHandler:
+    """
+    配置全局密码处理器
+    
+    Args:
+        rounds: bcrypt cost factor
+        
+    Returns:
+        配置好的 PasswordHandler 实例
+    """
+    global _default_handler
+    _default_handler = PasswordHandler(rounds=rounds)
+    return _default_handler
+
+
+def get_password_handler() -> PasswordHandler:
+    """
+    获取全局密码处理器
+    
+    Returns:
+        PasswordHandler 实例
+    """
+    global _default_handler
+    if _default_handler is None:
+        _default_handler = PasswordHandler()
+    return _default_handler