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The traditional design of space communication systems is based on DSP+FPGA architecture. The data processing ability of DSP will be fall off with the increasing of communication channel access-number. In order to meet the needs of high-speed and large amount of data transmission, a kind of space communication system with SOPC architecture design which consists of five microprocessors and 32 HDLC communication channels is introduced in this paper, which also describes the implementation and the working principle of the system. Experiments show that by integrating multiple microprocessors and communication function modules into a single FPGA, this design can enhance data processing capability with small size, light weight, low power consumption, good stability and anti-radiation characteristics.