Abstract:Satellite three levels test including equipment test、subsystems test and satellite level test. Testing costs are very expensive. All of the satellite equipment development has been completed is the premise of starting subsystems level test, Start subsystems level test before all of the satellite equipment has been completed can find and repair the design limitation of the equipment earlier. so that, we can achieve the purpose of saving development costs of satellite. Through the present situation of the satellite simulation study, proposes a method for constructing simulation test platform for satellite subsystems, and the simulation test platform has been verified in a joint test of a model of the satellite.