Aiming at the open-circuit fault of surface-mount dual three-phase permanent magnet synchronous motora fault-tolerant control scheme based on current optimization is proposed. Firstlyaccording to the basic Park transformationa coordinate transformation matrix that can realize the decoupling of stator inductance is deduced. A mathematical model under one-phase open-circuit fault is establishedand it is analyzed that the harmonic component of stator current is the cause of torque rippleand the fault-tolerant control problem under open-circuit fault is transformed into a multi-objective optimization problem of the d-q axis reference currents. Secondlyaiming at the shortcomings of the traditional gray wolf optimization algorithmsuch as uneven initial population distribution and the tendency to fall into local optimizationa Kent mapping-particle swarm-gray wolf optimization algorithm is proposed to realize the rapid and accurate optimization of current parameters in fault stateand obtain the maximum average torque while minimizing the torque ripple. Finallythe simulation results verify the effectiveness of the proposed method.