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To obtain a good drivability and high efficiency of the micro-electric vehicle,a new driving in-wheel motor design was analyzed and optimized.Maxwell software was used to build finite element simulation model of the driving in-wheel motor.The basic features and starting process were analyzed by field-circuit coupled finite element method.The intal complicated magnetic field distribution and dynamic performance simulation were obtained in different positions.No-load and load characteristics of the driving in-wheel motor was simulated,and the power consumption of materials was computed.The conformity of the final simulation results with the experimental data indicates that this method can be used to provide a theoretical basis to make further optimal design of this new driving in-wheel motor and its control system,so as to improve the starting torque and reduce torque ripple of the motor.This method can shorten the development cycle of in-wheel motors and save development costs,which has a wide range of engineering application value.