The purpose of this research is to design and combining test the Microsat's Communication subsystem. The structure design includes the improvements of the antenna expanding mechanism and communication module. In addition to the systematic design, the designs of satellite communication module command and transmit/receive the uplink/downlink telemetry are planned. To the link with the satellite computer system, completing the Closed Loop control test about transmit/receive the uplink/downlink telemetry, and develop the software of satellite ground station to cooperate with communication module and proceeding the test of the two-way wireless transmit . On the other hand, an intelligent agent system was introduced for the independence task of satellites design. Discuss and utilize the agent technology in self-handling and operation on Microsat's task, in order to develop the independent ability of satellite communication and realization of the independence satellite.