Based on the power drop caused by the mutual inductance fluctuation between the primary and the secondary coils in the dynamic process of the short-rail structure in the EV-DWPT system, this paper proposes an optimization design technology utilizing the pulse synchronization control method for the permeable rails structure. Firstly, the expressions of the output power and the primary and secondary coil current were deduced by analyzing the dual transmitter and single receiver circuit based on the LCC-S resonant topology. Secondly, the effects that the length of the permeable areas and the number of the coils on mutual inductance were analyzed by COMSOL and pulse synchronization control method. Finally, the simulation model of the circuit was established through the simulation platform PLECS. The simulation results show, by utilizing the pulse synchronization control method, the fluctuation of the mutual inductance is about 3% in the dynamic process of the coupler. Comparing to the 56% of the single exciting mode and the 32% of the traditional rectangular coil, the fluctuation of the mutual inductance has been greatly inhibited. And the output power fluctuation of the EV-DWPT system designed in this paper is ±3.2%. Keywords：wireless power transfer, EV-DWPT, impulsive synchronization, permeable rail, power fluctuation