In electric vehicle wireless power transfer (EVWPT) systems, misalignment tolerance has always been one of the concerns. This paper proposes an optimization method of EVWPT system misalignment tolerance through coupling mechanism design and circuit topology analysis. Using the mutual inductance complementary characteristics of the compensation coil and the receiving coil, and using the output series topology, the system has good misalignment tolerance performance and constant voltage (CV) output characteristics. Theoretical analysis and simulation results verify the effectiveness of the proposed method, and the system can achieve good load-independent CV output within the range of 50% misalignment.