Abstract: Based on the character of oriented-object and relative data base management system we can join the oriented-object technology to relative data base.The system supports the SQL complex object and the complex action of complex objects. It is the rejoin of oriented-object technology and trade relative data base technology. It has the strong function of relative data base and the model function of object. This paper supply the method of the relative data base design and map object to relative data base. The method is easy and useful.