diff --git a/chassis/config.py b/chassis/config.py
new file mode 100644
index 0000000..cbddbc7
--- /dev/null
+++ b/chassis/config.py
@@ -0,0 +1,27 @@
+import os
+
+from chassis.consts import const
+
+
+class Config:
+    """
+    基础配置
+    """
+
+    # 先读 env 环境变量中的配置
+
+    # 指定加密KEY
+    SECRET_KEY = os.getenv('SECRET_KEY')
+
+    # 指定数据库
+    DEFAULT_DATABASE_URI = os.getenv('DEFAULT_DATABASE_URI')
+    READONLY_DATABASE_URI = os.getenv('READONLY_DATABASE_URI')
+    const.DB_CONFIG_ITEM = {
+        const.DEFAULT_DB_KEY: DEFAULT_DATABASE_URI,
+        const.READONLY_DB_KEY: READONLY_DATABASE_URI,
+    }
+
+    STATSD_PREFIX = os.getenv('STATSD_PREFIX')
+    STATSD_HOST = os.getenv('STATSD_HOST')
+    STATSD_PORT = os.getenv('STATSD_PORT')
+
diff --git a/chassis/consts.py b/chassis/consts.py
new file mode 100644
index 0000000..0abb517
--- /dev/null
+++ b/chassis/consts.py
@@ -0,0 +1,133 @@
+class ConstError(TypeError):
+    pass
+
+
+class _const:
+    def __setattr__(self, name, value):
+        if name in self.__dict__:
+            raise ConstError("Can't rebind const (%s)" % name)
+        if not name.isupper():
+            raise ConstError("Const must be upper.")
+        self.__dict__[name] = value
+
+
+const = _const()
+
+const.DB_CONFIG_ITEM = 'databases'
+const.DEFAULT_DB_KEY = 'default'
+const.READONLY_DB_KEY = 'readonly'
+
+const.REDIS_CONFIG_ITEM = 'redises'
+const.RD_HOST_KEY = 'host'
+const.RD_PORT_KEY = 'port'
+const.RD_DB_KEY = 'db'
+const.RD_AUTH_KEY = 'auth'
+const.RD_CHARSET_KEY = 'charset'
+const.RD_DECODE_RESPONSES = 'decode_responses'
+const.RD_PASSWORD_KEY = 'password'
+const.DEFAULT_RD_KEY = 'default'
+
+const.MQ_CONFIG_ITEM = 'mqs'
+const.MQ_ADDR = 'MQ_ADDR'
+const.MQ_PORT = 'MQ_PORT'
+const.MQ_VHOST = 'MQ_VHOST'
+const.MQ_USER = 'MQ_USER'
+const.MQ_PWD = 'MQ_PWD'
+const.DEFAULT_MQ_KEY = 'default'
+const.AGENT_MQ_KEY = 'agent'
+
+const.APP_NAME = 'app_name'
+const.LOG_PATH = 'log_path'
+const.LOG_BACKUP_COUNT = 'log_backup_count'
+const.LOG_MAX_FILE_SIZE = 'log_max_filesize'
+
+const.REQUEST_START_SIGNAL = 'request_start'
+const.REQUEST_FINISHED_SIGNAL = 'request_finished'
+
+const.NW_SALT = 'nw'
+const.ALY_SALT = 'aly'
+const.TX_SALT = 'tx'
+const.SG_SALT = 'sg'
+const.DEFAULT_SALT = 'default'
+const.SALT_API = 'salt_api'
+const.SALT_USER = 'salt_username'
+const.SALT_PW = 'salt_password'
+const.SALT_OUT = 'salt_timeout'
+
+const.NW_INCEPTION = 'nw'
+const.ALY_INCEPTION = 'aly'
+const.TX_INCEPTION = 'tx'
+const.DEFAULT_INCEPTION = 'default'
+
+const.REGION = "cn-hangzhou"
+const.PRODUCT_NAME = "Dysmsapi"
+const.DOMAIN = "dysmsapi.aliyuncs.com"
+
+# app settings
+const.APP_SETTINGS = 'APP_SETTINGS'
+# all user info
+const.USERS_INFO = 'USERS_INFO'
+# API GW
+const.WEBSITE_API_GW_URL = 'api_gw'
+const.API_AUTH_KEY = 'settings_auth_key'
+const.EMAILLOGIN_DOMAIN = 'EMAILLOGIN_DOMAIN'
+const.EMAILLOGIN_SERVER = 'EMAILLOGIN_SERVER'
+# e-mail
+const.EMAIL_SUBJECT_PREFIX = "EMAIL_SUBJECT_PREFIX"
+const.EMAIL_HOST = "EMAIL_HOST"
+const.EMAIL_PORT = "EMAIL_PORT"
+const.EMAIL_HOST_USER = "EMAIL_HOST_USER"
+const.EMAIL_HOST_PASSWORD = "EMAIL_HOST_PASSWORD"
+const.EMAIL_USE_SSL = "EMAIL_USE_SSL"
+const.EMAIL_USE_TLS = "EMAIL_USE_TLS"
+
+# 短信配置
+const.SMS_REGION = "SMS_REGION"
+const.SMS_PRODUCT_NAME = "SMS_PRODUCT_NAME"
+const.SMS_DOMAIN = "SMS_DOMAIN"
+
+const.SMS_ACCESS_KEY_ID = 'SMS_ACCESS_KEY_ID'
+const.SMS_ACCESS_KEY_SECRET = 'SMS_ACCESS_KEY_SECRET'
+# 钉钉
+const.DING_TALK_WEBHOOK = "DING_TALK_WEBHOOK"
+# 存储
+const.STORAGE_REGION = "STORAGE_REGION"
+const.STORAGE_NAME = "STORAGE_NAME"
+const.STORAGE_PATH = "STORAGE_PATH"
+const.STORAGE_KEY_ID = "STORAGE_KEY_ID"
+const.STORAGE_KEY_SECRET = "STORAGE_KEY_SECRET"
+
+# LDAP
+const.LDAP_SERVER_HOST = "LDAP_SERVER_HOST"
+const.LDAP_SERVER_PORT = "LDAP_SERVER_PORT"
+const.LDAP_ADMIN_DN = "LDAP_ADMIN_DN"
+const.LDAP_ADMIN_PASSWORD = "LDAP_ADMIN_PASSWORD"
+const.LDAP_SEARCH_BASE = "LDAP_SEARCH_BASE"
+const.LDAP_SEARCH_FILTER = "LDAP_SEARCH_FILTER"
+const.LDAP_ATTRIBUTES = "LDAP_ATTRIBUTES"
+const.LDAP_USE_SSL = "LDAP_USE_SSL"
+const.LDAP_ENABLE = "LDAP_ENABLE"
+
+# token 超时时间
+const.TOKEN_EXP_TIME = "TOKEN_EXP_TIME"
+
+# 全局 二次认证
+const.MFA_GLOBAL = 'MFA_GLOBAL'
+
+# 任务状态
+const.STATE_NEW = '0'
+const.STATE_WAIT = '1'
+const.STATE_RUNNING = '2'
+const.STATE_SUCCESS = '3'
+const.STATE_ERROR = '4'
+const.STATE_MANUAL = '5'
+const.STATE_BREAK = '6'
+const.STATE_TIMING = '7'
+const.STATE_UNKNOWN = '8'
+const.STATE_FAIL = '9'
+const.STATE_IGNORE = '10'  ## 忽略
+const.EXEC_TIMEOUT = 1800
+
+# 节点地址
+const.NODE_ADDRESS = 'NODE_ADDRESS'
+const.EXEC_NODE_MAP_KEY = 'EXEC_NODE_MAP_KEY'
diff --git a/chassis/db_context.py b/chassis/db_context.py
new file mode 100644
index 0000000..b2be323
--- /dev/null
+++ b/chassis/db_context.py
@@ -0,0 +1,61 @@
+from sqlalchemy import create_engine
+from sqlalchemy.orm import sessionmaker
+
+from chassis.config import Config
+from chassis.consts import const
+
+engines = {}
+
+
+def init_engine(config):
+    if config:
+        databases = getattr(config, const.DB_CONFIG_ITEM)
+    else:
+        databases = getattr(Config, const.DB_CONFIG_ITEM)
+    for db_key, db_url in databases.items():
+        engine = create_engine(db_url,
+                               logging_name=db_key, poolclass=None, pool_size=5, max_overflow=20, pool_recycle=3600,
+                               pool_pre_ping=True)
+        engines[db_key] = engine
+
+
+class DBContext(object):
+    def __init__(self, rw='r', db_key=None, need_commit=False, **settings):
+        self.__db_key = db_key
+        if not self.__db_key:
+            if rw == 'w':
+                self.__db_key = const.DEFAULT_DB_KEY
+            elif rw == 'r':
+                self.__db_key = const.READONLY_DB_KEY
+        engine = self.__get_db_engine(self.__db_key, **settings)
+        self.__engine = engine
+        self.need_commit = need_commit
+
+    # @property
+    # def db_key(self):
+    #     return self.__db_key
+
+    @staticmethod
+    def __get_db_engine(db_key, **settings):
+        if len(engines) == 0:
+            init_engine(**settings)
+        return engines[db_key]
+
+    @property
+    def session(self):
+        return self.__session
+
+    def __enter__(self):
+        self.__session = sessionmaker(bind=self.__engine)()
+        return self.__session
+
+    def __exit__(self, exc_type, exc_val, exc_tb):
+        if self.need_commit:
+            if exc_type:
+                self.__session.rollback()
+            else:
+                self.__session.commit()
+        self.__session.close()
+
+    def get_session(self):
+        return self.__session
\ No newline at end of file