In this paper, a simplified MTPA method is proposed for the MTPA control strategy based on the traditional formula, which can achieve the same effect as the traditional formula method. At the same time, it simplifies the analysis and calculation, which helps to reduce the computational load in the process of controller implementation. Since the motor parameters change to a certain extent during operation, a high-frequency injection online parameter identification function is added on the basis of the simplified control strategy, which identifies the motor inductance parameters online, so as to achieve more accurate MTPA control. In order to verify the accuracy of the analytical calculation method, we verified it through simulation. Through simulation, the identification results of the d-axis inductance are within 0.5% of the actual inductance, and the identification results of the q-axis inductance parameters are within 2.5% of the actual inductance, so the parameter identification effect is good, and the high-precision MTPA control can be achieved.