diff --git a/app/agent/prompt/__init__.py b/app/agent/prompt/__init__.py
index c54771bd..e90089b8 100644
--- a/app/agent/prompt/__init__.py
+++ b/app/agent/prompt/__init__.py
@@ -281,7 +281,10 @@ class PromptManager:
             db_info = f"SQLite ({settings.CONFIG_PATH / 'db' / 'moviepilot.db'})"
         else:
             db_password = settings.DB_POSTGRESQL_PASSWORD or ""
-            db_info = f"PostgreSQL ({settings.DB_POSTGRESQL_USERNAME}:{db_password}@{settings.DB_POSTGRESQL_HOST}:{settings.DB_POSTGRESQL_PORT}/{settings.DB_POSTGRESQL_DATABASE})"
+            db_info = (
+                f"PostgreSQL ({settings.DB_POSTGRESQL_USERNAME}:{db_password}@"
+                f"{settings.DB_POSTGRESQL_TARGET}/{settings.DB_POSTGRESQL_DATABASE})"
+            )
 
         info_lines = [
             f"- 当前时间: {strftime('%Y-%m-%d %H:%M:%S')}",
diff --git a/app/core/config.py b/app/core/config.py
index 3361fd86..a8a71454 100644
--- a/app/core/config.py
+++ b/app/core/config.py
@@ -10,7 +10,7 @@ import threading
 from asyncio import AbstractEventLoop
 from pathlib import Path
 from typing import Any, Dict, List, Optional, Tuple, Type
-from urllib.parse import urlparse
+from urllib.parse import quote, urlencode, urlparse
 
 from dotenv import set_key
 from pydantic import BaseModel, Field, ConfigDict, model_validator
@@ -126,8 +126,8 @@ class ConfigModel(BaseModel):
     DB_SQLITE_MAX_OVERFLOW: int = 50
     # PostgreSQL 主机地址
     DB_POSTGRESQL_HOST: str = "localhost"
-    # PostgreSQL 端口
-    DB_POSTGRESQL_PORT: int = 5432
+    # PostgreSQL 端口；使用 Unix Socket 时可留空
+    DB_POSTGRESQL_PORT: str = "5432"
     # PostgreSQL 数据库名
     DB_POSTGRESQL_DATABASE: str = "moviepilot"
     # PostgreSQL 用户名
@@ -142,7 +142,7 @@ class ConfigModel(BaseModel):
     # ==================== 缓存配置 ====================
     # 缓存类型，支持 cachetools 和 redis，默认使用 cachetools
     CACHE_BACKEND_TYPE: str = "cachetools"
-    # 缓存连接字符串，仅外部缓存（如 Redis、Memcached）需要
+    # 缓存连接字符串，仅外部缓存（如 Redis、Memcached）需要，支持 Redis Unix Socket URL
     CACHE_BACKEND_URL: Optional[str] = "redis://localhost:6379"
     # Redis 缓存最大内存限制，未配置时，如开启大内存模式时为 "1024mb"，未开启时为 "256mb"
     CACHE_REDIS_MAXMEMORY: Optional[str] = None
@@ -921,6 +921,39 @@ class Settings(BaseSettings, ConfigModel, LogConfigModel):
             }
         return None
 
+    @property
+    def DB_POSTGRESQL_SOCKET_MODE(self) -> bool:
+        host = (self.DB_POSTGRESQL_HOST or "").strip()
+        return host.startswith("/")
+
+    @property
+    def DB_POSTGRESQL_TARGET(self) -> str:
+        if self.DB_POSTGRESQL_SOCKET_MODE:
+            target = f"socket {self.DB_POSTGRESQL_HOST}"
+            if self.DB_POSTGRESQL_PORT:
+                target = f"{target} (port {self.DB_POSTGRESQL_PORT})"
+            return target
+        if self.DB_POSTGRESQL_PORT:
+            return f"{self.DB_POSTGRESQL_HOST}:{self.DB_POSTGRESQL_PORT}"
+        return self.DB_POSTGRESQL_HOST
+
+    def DB_POSTGRESQL_URL(self, driver: Optional[str] = None) -> str:
+        scheme = "postgresql" if not driver else f"postgresql+{driver}"
+        username = quote(str(self.DB_POSTGRESQL_USERNAME), safe="")
+        database = quote(str(self.DB_POSTGRESQL_DATABASE), safe="")
+        auth = username
+        if self.DB_POSTGRESQL_PASSWORD:
+            auth = f"{auth}:{quote(str(self.DB_POSTGRESQL_PASSWORD), safe='')}"
+
+        if self.DB_POSTGRESQL_SOCKET_MODE:
+            query = {"host": self.DB_POSTGRESQL_HOST}
+            if self.DB_POSTGRESQL_PORT:
+                query["port"] = self.DB_POSTGRESQL_PORT
+            return f"{scheme}://{auth}@/{database}?{urlencode(query)}"
+
+        port = f":{self.DB_POSTGRESQL_PORT}" if self.DB_POSTGRESQL_PORT else ""
+        return f"{scheme}://{auth}@{self.DB_POSTGRESQL_HOST}{port}/{database}"
+
     @property
     def PROXY_SERVER(self):
         if self.PROXY_HOST:
diff --git a/app/db/__init__.py b/app/db/__init__.py
index d854a8f0..fc473aa5 100644
--- a/app/db/__init__.py
+++ b/app/db/__init__.py
@@ -116,11 +116,7 @@ def _get_postgresql_engine(is_async: bool = False):
     """
     获取PostgreSQL数据库引擎
     """
-    # 构建PostgreSQL连接URL
-    if settings.DB_POSTGRESQL_PASSWORD:
-        db_url = f"postgresql://{settings.DB_POSTGRESQL_USERNAME}:{settings.DB_POSTGRESQL_PASSWORD}@{settings.DB_POSTGRESQL_HOST}:{settings.DB_POSTGRESQL_PORT}/{settings.DB_POSTGRESQL_DATABASE}"
-    else:
-        db_url = f"postgresql://{settings.DB_POSTGRESQL_USERNAME}@{settings.DB_POSTGRESQL_HOST}:{settings.DB_POSTGRESQL_PORT}/{settings.DB_POSTGRESQL_DATABASE}"
+    db_url = settings.DB_POSTGRESQL_URL()
 
     # PostgreSQL连接参数
     _connect_args = {}
@@ -150,12 +146,11 @@ def _get_postgresql_engine(is_async: bool = False):
 
         # 创建数据库引擎
         engine = create_engine(**_db_kwargs)
-        print(f"PostgreSQL database connected to {settings.DB_POSTGRESQL_HOST}:{settings.DB_POSTGRESQL_PORT}/{settings.DB_POSTGRESQL_DATABASE}")
+        print(f"PostgreSQL database connected to {settings.DB_POSTGRESQL_TARGET}/{settings.DB_POSTGRESQL_DATABASE}")
 
         return engine
     else:
-        # 构建异步PostgreSQL连接URL
-        async_db_url = f"postgresql+asyncpg://{settings.DB_POSTGRESQL_USERNAME}:{settings.DB_POSTGRESQL_PASSWORD}@{settings.DB_POSTGRESQL_HOST}:{settings.DB_POSTGRESQL_PORT}/{settings.DB_POSTGRESQL_DATABASE}"
+        async_db_url = settings.DB_POSTGRESQL_URL("asyncpg")
 
         # 数据库参数，只能使用 NullPool
         _db_kwargs = {
@@ -168,7 +163,7 @@ def _get_postgresql_engine(is_async: bool = False):
         }
         # 创建异步数据库引擎
         async_engine = create_async_engine(**_db_kwargs)
-        print(f"Async PostgreSQL database connected to {settings.DB_POSTGRESQL_HOST}:{settings.DB_POSTGRESQL_PORT}/{settings.DB_POSTGRESQL_DATABASE}")
+        print(f"Async PostgreSQL database connected to {settings.DB_POSTGRESQL_TARGET}/{settings.DB_POSTGRESQL_DATABASE}")
 
         return async_engine
 
diff --git a/app/db/init.py b/app/db/init.py
index 66a21733..0515ffb7 100644
--- a/app/db/init.py
+++ b/app/db/init.py
@@ -28,10 +28,7 @@ def update_db():
         
         # 根据数据库类型设置不同的URL
         if settings.DB_TYPE.lower() == "postgresql":
-            if settings.DB_POSTGRESQL_PASSWORD:
-                db_url = f"postgresql://{settings.DB_POSTGRESQL_USERNAME}:{settings.DB_POSTGRESQL_PASSWORD}@{settings.DB_POSTGRESQL_HOST}:{settings.DB_POSTGRESQL_PORT}/{settings.DB_POSTGRESQL_DATABASE}"
-            else:
-                db_url = f"postgresql://{settings.DB_POSTGRESQL_USERNAME}@{settings.DB_POSTGRESQL_HOST}:{settings.DB_POSTGRESQL_PORT}/{settings.DB_POSTGRESQL_DATABASE}"
+            db_url = settings.DB_POSTGRESQL_URL()
         else:
             db_location = settings.CONFIG_PATH / 'user.db'
             db_url = f"sqlite:///{db_location}"
diff --git a/docs/postgresql-setup.md b/docs/postgresql-setup.md
index bfc3eaae..9d1bdde5 100644
--- a/docs/postgresql-setup.md
+++ b/docs/postgresql-setup.md
@@ -24,7 +24,7 @@ DB_TYPE=postgresql
 # PostgreSQL 主机地址
 DB_POSTGRESQL_HOST=localhost
 
-# PostgreSQL 端口
+# PostgreSQL 端口；使用 Unix Socket 时可留空
 DB_POSTGRESQL_PORT=5432
 
 # PostgreSQL 数据库名
@@ -43,6 +43,21 @@ DB_POSTGRESQL_POOL_SIZE=20
 DB_POSTGRESQL_MAX_OVERFLOW=30
 ```
 
+### 3. Unix Socket 连接
+
+如果 PostgreSQL 通过 Unix Socket 暴露，可以把 `DB_POSTGRESQL_HOST` 设置为套接字目录。
+
+```bash
+DB_TYPE=postgresql
+DB_POSTGRESQL_HOST=/var/run/postgresql
+DB_POSTGRESQL_PORT=
+DB_POSTGRESQL_DATABASE=moviepilot
+DB_POSTGRESQL_USERNAME=moviepilot
+DB_POSTGRESQL_PASSWORD=moviepilot
+```
+
+如需显式指定 socket 端口，也可以保留 `DB_POSTGRESQL_PORT`，程序会生成带 `host=/path/to/socket` 查询参数的 PostgreSQL URL。
+
 ## Docker 部署
 
 ### 使用外部 PostgreSQL
@@ -60,6 +75,13 @@ DB_POSTGRESQL_USERNAME=your-username
 DB_POSTGRESQL_PASSWORD=your-password
 ```
 
+使用 Redis Unix Socket 时，可直接设置 `CACHE_BACKEND_URL`，例如：
+
+```bash
+CACHE_BACKEND_TYPE=redis
+CACHE_BACKEND_URL=unix:///var/run/redis/redis.sock?db=0
+```
+
 ## 数据迁移
 
 ### 从 SQLite 迁移到 PostgreSQL
diff --git a/tests/test_postgresql_socket_config.py b/tests/test_postgresql_socket_config.py
new file mode 100644
index 00000000..ca586bf8
--- /dev/null
+++ b/tests/test_postgresql_socket_config.py
@@ -0,0 +1,101 @@
+import sys
+import unittest
+from enum import Enum
+from types import ModuleType
+
+
+def _stub_module(name: str, **attrs):
+    module = sys.modules.get(name)
+    if module is None:
+        module = ModuleType(name)
+        sys.modules[name] = module
+    for key, value in attrs.items():
+        setattr(module, key, value)
+    return module
+
+
+class _DummyLogger:
+    def __getattr__(self, _name):
+        return lambda *args, **kwargs: None
+
+
+_stub_module(
+    "app.log",
+    logger=_DummyLogger(),
+    log_settings=_DummyLogger(),
+    LogConfigModel=type("LogConfigModel", (), {}),
+)
+_stub_module("psutil")
+_schemas_module = _stub_module(
+    "app.schemas", MediaType=Enum("MediaType", {"Movie": "Movie", "TV": "TV"})
+)
+_schemas_module.__getattr__ = lambda name: type(name, (), {})
+_stub_module("version", APP_VERSION="test")
+
+
+from app.core.config import Settings
+
+
+class PostgreSQLSocketConfigTests(unittest.TestCase):
+    def test_postgresql_tcp_url_keeps_host_and_port(self):
+        settings = Settings(
+            DB_POSTGRESQL_HOST="db",
+            DB_POSTGRESQL_PORT="5433",
+            DB_POSTGRESQL_DATABASE="moviepilot",
+            DB_POSTGRESQL_USERNAME="user",
+            DB_POSTGRESQL_PASSWORD="pass",
+        )
+
+        self.assertFalse(settings.DB_POSTGRESQL_SOCKET_MODE)
+        self.assertEqual(
+            settings.DB_POSTGRESQL_URL(),
+            "postgresql://user:pass@db:5433/moviepilot",
+        )
+        self.assertEqual(
+            settings.DB_POSTGRESQL_URL("asyncpg"),
+            "postgresql+asyncpg://user:pass@db:5433/moviepilot",
+        )
+        self.assertEqual(settings.DB_POSTGRESQL_TARGET, "db:5433")
+
+    def test_postgresql_socket_url_uses_host_query_param(self):
+        settings = Settings(
+            DB_POSTGRESQL_HOST="/var/run/postgresql",
+            DB_POSTGRESQL_PORT="",
+            DB_POSTGRESQL_DATABASE="moviepilot",
+            DB_POSTGRESQL_USERNAME="user",
+            DB_POSTGRESQL_PASSWORD="pass",
+        )
+
+        self.assertTrue(settings.DB_POSTGRESQL_SOCKET_MODE)
+        self.assertIsNone(settings.DB_POSTGRESQL_PORT_VALUE)
+        self.assertEqual(
+            settings.DB_POSTGRESQL_URL(),
+            "postgresql://user:pass@/moviepilot?host=%2Fvar%2Frun%2Fpostgresql",
+        )
+        self.assertEqual(
+            settings.DB_POSTGRESQL_URL("asyncpg"),
+            "postgresql+asyncpg://user:pass@/moviepilot?host=%2Fvar%2Frun%2Fpostgresql",
+        )
+        self.assertEqual(settings.DB_POSTGRESQL_TARGET, "socket /var/run/postgresql")
+
+    def test_postgresql_socket_url_can_keep_explicit_port(self):
+        settings = Settings(
+            DB_POSTGRESQL_HOST="/var/run/postgresql",
+            DB_POSTGRESQL_PORT="5432",
+            DB_POSTGRESQL_DATABASE="moviepilot",
+            DB_POSTGRESQL_USERNAME="user",
+            DB_POSTGRESQL_PASSWORD="",
+        )
+
+        self.assertEqual(
+            settings.DB_POSTGRESQL_URL(),
+            "postgresql://user@/moviepilot?host=%2Fvar%2Frun%2Fpostgresql&port=5432",
+        )
+        self.assertEqual(
+            settings.DB_POSTGRESQL_TARGET,
+            "socket /var/run/postgresql (port 5432)",
+        )
+
+
+if __name__ == "__main__":
+    unittest.main()