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At present, the CAN (Controller Area Network) bus test technology cannot real-time monitor the network's communication quality of the physical layer. If the bus malfunction happens, the current technology cannot position the malfunction node. Aiming at above shortcomings, this paper puts forward CAN bus Loop-test technology of the comprehensive electronic equipment, designs the experiment plan of the loop-test, and validates the feasibility of the technology on malfunction position. The results illustrate our approach is viable and effective.