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Simulation is an important step during the design of control systems. Based on the series tools of MATLABSimulinkxPC, the real-time simulation environment is constructed. By adopting the mixed modeling measures that comprise Simulink, Stateflow and S-function, models for satellite attitude dynamics, all sensors and actuators, control logics of the antenna and etc are all built successfully, then the modes selecting, scheduling and interfaces communication are realized effectively. The tracking and data relay satellite (TDRS) simulator is designed. It simplifies the experiment system. The turn table is eliminated and the experiment system can also reflect the effect of the attitude movement acting on the antenna pointing by using the TDRS simulator. The experiment results indicate that the experiment system can verify the antenna acquiring and tracking processes and is beneficial to the design of the user satellitepsilas antenna pointing control system for engineers.