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A boundary scan controller based on 51-series MCU,with a control interface programed by Microsoft Visual C++ software,is designed and manufactured in order to improve the fault detection ability of modern military equipment. The controller,which is made up of an USB to serial interface circuit and MCU,has the merits of simple structure, high universality and low cost. The test Instructions or data from computer are transformed to JTAG bus signals meeting the standard of IEEE1149.1 according to USB and JTAG protocol conversion. The JTAG signals are injected in EPM7128 chips as test object,then collect test response and implement the fault detection of hardware circuit based on test chips. The test results show that the design of boundary scan controller can control the boundary scan state of the single chip and chip cascades,and complete fault detection on the chip and its peripheral circuit without control of the internal logic of the programmable logic chip program.