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In the integrated electronic systems of aviation, aerospace, automobile, communication, etc., the proportion of embedded software is higher and higher, and the functions and data interaction processes are more and more complex. In the embedded software testing, the existing hardware in the loop simulation system based on bus communication lacks or cannot provide the simulation ability of interactive process conveniently. Aiming at this problem, presents a design of embedded bus interface test system based on bus communication, bus data receiving and sending, and data receiving and sending process control, which can adapt to MIL-STD-1553B bus, Ethernet, RS232 / 422 / 485 bus, can bus, arnic429 bus, etc., and has the functions of test case design, automatic execution, receiving data analysis, etc., and describes its system Design, software design, important function design realization and test analysis. The system has been designed in prototype and applied in many types of projects, which improves the efficiency of operators to build test environment and shortens the time of developing simulation system for project customization.