CREATE LOGIN [user] WITH PASSWORD='password',DEFAULT_DATABASE=[your_db],CHECK_POLICY=OFF
GO

CREATE USER [user] FOR LOGIN [user]
EXEC sp_addrolemember N'db_datareader',N'your_db'
EXEC sp_addrolemember N'db_datawriter',N'your_db'
GO

其中CHECK_POLICY = OFF关闭密码复杂性检查等