In order to improve the large overflow loss of continuously variable transmission (CVT) hydraulic oil pump,PMSM (permanent magnet synchronous motor)-driven electric oil pump was used as the oil supply source of CVT.A control algorithm based on fuzzy PI was proposed,which modified the parameters of PI controller by fuzzy control on the basis of vector control structure,to solve the traditional PI control could not meet the needs of complex control systems.In order to verify the validity of the algorithm,the models of motor control system under two algorithms were built in MATLAB/Simulink,and the control results were compared and analyzed.Finally,the simulation of the electric oil pump based on the algorithm was completed under the CVT extreme operating condition,i.e.under the condition of vehicle emergency braking.The results show that the proposed control strategy can effectively improve the system response speed and anti-interference ability,and the electric oil pump based on the algorithm can meet the CVT normal work requirements.