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For improving independent maintaining-ability about the imported armament in China, one portable all-purpose circuits fault diagnosis device is designed and developed. The fixing-platform is designed for the analog circuits, digital circuits and mixed-signal circuits of the imported armaments. The integrated diagnose hardware resources platform is built based on PXI bus. The complex fault diagnosis method based on voltage measurement and current measurement and the fault diagnosis stratagem based on knowledge deduces mechanism are applied in this device. The fault diagnosis has advantages of compact framework, portable carry, the fault located accuracy etc.