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Memory subsystem is designed to obtain flight test data. The result of final inspection before launch directly influences the judgment of memory subsystem state. Data is transmitted by high-speed long-distance data transmission route for memory subsystem, which makes it a key factor in state judgment. The purpose is to design data transmission route for memory subsystem with route calculation modeling and the introduction of radio frequency route modeling in cable transmission. The route calculation modeling, based on signal parameter, replaces real cable test before. The introduction of radio frequency route modeling and vector network analyzer is proven effective in route attenuation test and memory subsystem field test, which verifies the design of high-speed long-distance data transmission route for memory subsystem. Basing on the model,the system route is designed. The test result of route margin is more than 5 dB.