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With 1553B bus becoming the main standard of avionics bus, UAVs with limited load space and power supply put higher requirements for the miniaturization, low power consumption and low cost of 1553B bus airborne equipment, which cannot be met by previous technical schemes. Based on the research of 1553B bus remote terminal technology and the specific requirements of a certain type of hanging missile, and comparing the functions, package size, power consumption and price of several 1553B protocol chips at home and abroad, a 1553B remote terminal technology scheme with DSP (TMS320F2812) as the control core and HI-6121 as the protocol chip is proposed. The technical characteristics of HI-6121，system hard technical scheme and flow chart of system software design are introduced in detail. The scheme has been applied to a certain type of hanging missile and missile simulator, and has passed various performance tests and environmental adaptability tests in engineering and modeling stages. The test results show that the communication between remote terminal based on DSP and HI-6121 and 1553B bus control terminal is stable and reliable, which meets the requirements of miniaturization, low power consumption and low cost of UAV-borne equipment, and has high reliability and versatility.