Electric power electronic device is widely used in power system, and in the process of design of power electronic drive device, because it is not only to carry out highspeed operation, but also to carry on the fast processing of high frequency signal. Therefore, the combination of DSP and FPGA is usually used. In the design process, the communication problem of DSP and FPGA has been a focus of research. In this paper, a serial communication scheme is proposed, which is based on SPI (LVDS), FPGA (IO) and SelectIO (XC6SLX9). The DSP module is configured with SPI (TMFS28335). The scheme has the advantages of high speed of communication, strong antiinterference ability, FPGA and DSP can be separated.