Aiming at the problem that the efficiency of magnetic coupling resonance-wireless power transmission (MCR-WPT) is reduced due to load changes during the transmission process, an efficient inverter is designed.The improved structure can significantly widen the load adaptation range of MCR-WPT system under high efficiency power transmission. After analyzing the relationship between the load and input impedance of MCR-WTP system and using the E-type inverter as the power supply, the inverter of the MCR-WPT system is fully soft switched by changing the structure of inverter.The operation efficiency of MCR-WTP system keep on the high level. Simulation results verify the effectiveness of the proposed structure.