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In the actual process of permanent magnet synchronous motor(PMSM),the parameters of the motor will change under the influence of temperature and saturation degree of magnetic circuit, which will reduce the control effect of the servo system and even damage the motor. Therefore, it is necessary to obtain the parameters of the motor through parameter identification to ensure the control effect. The motor parameters in static state and stable operation state are obtained through off-line identification, and used as the initial value of online identification. the motor parameters are identified online based on model reference adaptive .Taking the direct axis and quadrature axis current equation in the rotating coordinate system as the reference model, the resistance and inductance of the motor are identified by the collected parameters such as voltage, current and speed. The motor model which can change parameters in real time is built in MATLAB, and the model reference adaptive module is built for online identification. The effectiveness of this method is verified by simulation.