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With the development of digital and intelligent radar, the high-speed digital circuit module comprising a plurality of DSP chips have been more widely used. The signal processing system is made of high-speed digital circuit modules based on DSP chips. Aimed at the weak diagnostic capability problem of the signal processing system, the paper puts forward the method of optimizing the module BIT software design to enhance the module’s ability of fault diagnosis. The BIT test requirements of the module are analyzed. And the main BIT test item’s test principle and design method for the module are highlighted. The module BIT’s test method is validated by the module self-test software panel. The test results show that the method has the advantages of good practicability and low cost.