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The guidance and control semi physical simulation system plays an important role in the development of guided weapons, and is an important way to verify the correctness of missile guidance and control system design and software design. The traditional Windows operating system has poor real-time performance, which brings many uncertainties to the hardware in the loop simulation test. Therefore, this paper uses the Windows+RTX scheme to complete the hardware and software design of the hardware in the loop simulation system. Through shared memory, the communication between Windows processes and RTX processes is realized to ensure the accuracy of data transmission and the real-time performance of the system. The final missile guidance and control semi physical simulation test results show that the designed semi physical simulation system is reasonable, and has good real-time performance, high reliability, and strong universality.