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For the testing requirements of a digital-analog hybrid circuit board of the flight control system, used boundary-scan technology to design the test system without using external signal source and signal acquisition equipment. Introduced the PCI-410 boundary scan core suite and ScanWorks test software, studied the boundary scan test method, described the test system scheme design, test flow development steps and test program execution method in detail, and verified the feasibility of the design through practical testing, which provided practical test methods and means for the test of digital circuit boards and simple digital-analog hybrid circuit boards, and had good application value.