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The existing equipment state data of a complex equipment can not meet the requirements of the entire vehicle fault diagnosis and health status assessment, to meet the monitoring needs of vehicle data, the vehicular state monitoring system was designed by analyzing the vehicle electrical signal. The overall architecture of the vehicular state monitoring system was proposed, hardware of integrated control circuit for processing, real-time data acquisition and processing circuit, bus data state circuit and vehicle display system has been designed, software of vehicular collection and alarm systems and display systems has been designed, Finally, the vehicle testing data show that the system can monitor the real-time status state of complex equipment and complete the basic fault diagnosis functions. It makes possible for early detection of faults, disposal measures proposed and health management of the equipment.