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In order to improve the reliability of spacecraft FPGA equipment, the reliability design of spacecraft FPGA based on three-mode redundant architecture is proposed. According to the basic connection principle of FPGA architecture, the processing unit, configuration unit, RF unit and double closed-loop circuit organization are designed to complete the research on the topology of spacecraft FPGA. On this basis, the bus communication serial port is connected, and according to the queue request of the data buffer, the established state of the bus state machine is controlled, and the transmission conversion of the spacecraft FPGA structure is completed. The key device FPGA, the reset space chip, and the whole star combination are debugged separately to realize the characteristic analysis of the three-mode redundant architecture, and the spacecraft FPGA design based on the three-mode redundant architecture is completed. The experimental results show that with the increase of equipment navigation time, the maximum values of MPPT and SPPT indicators account for more than 70%, and the high reliability of spacecraft FPGAs can be effectively maintained.