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In the starting process of the armored vehicle, the DC motor is prone to failure.The traditional diagnosis method of motor is to make the maintenance plan regularly, which is easy to cause the problem of insufficient maintenance, excessive maintenance and blind maintenance,In order to deeply analyze the variation of the parameters of the motor fault, to build a set of system which can collect the operating parameters of the motor,in the frequency domain analysis of the armature current and the vibration signal, it can reflect the characteristics of the fault.The system uses STM32103C8T6 as the main control chip, the current, vibration signal acquisition circuit, signal conditioning circuit, A/D conversion module, data storage module was programmed to the armature current of DC motor and vibration signal real-time acquisition and data processing of the follow-up call to save the PC.The starting process of different fault bearing parts of current and vibration signal measured by the comparison of DC motor, use MATLAB simulation to achieve a time-domain signal display, and in the MATLAB platform, the programming of the time-frequency domain analysis of vibration signal. The simulation results show that the acquisition system can accurately measure the signal, has the advantages of low cost, small size, high accuracy, and can provide a good data base for the fault feature extraction.