Abstract: An integrative design of attitude control and satellite keeping system are introduced.In this case,the number of on board computers can be reduced,the real time characteristic of the information process can be enhanced,and the advantage of the light,small and low cost of the small satellite can also be realized.The hardware architecture of the attitude control system,the fly modes of satellite and their control strategy,the architecture and layout design of the satellite keeping system,the interface of the attitude control system and the satellite keeping system are discussed here.