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The air-to-air communication machine is the key communication link in the rendezvous and docking of spacecraft and target aircraft. As the core of the air-to-air communication machine, the FPGA is composed of receiving channel and transmitting channel _[1].In order to ensure the correctness of the spread spectrum communication FPGA, robustness, and improve test coverage and integrity, this paper puts forward a applicable to empty the spread spectrum communication FPGA digital simulation method, gives the intermediate frequency signal generated model implementation scheme of settlement expansion receiving model, and finally the simulation results is given. Simulation results show that the simulation method based on FPGA in the closed loop test, completion incentives and signal acquisition, recording, comparison, simulation can effectively increase the coverage, more truly reflect the FPGA work details, help the designer found the FPGA design problem as soon as possible, improve the quality of the verification.