An LCC-S compensation network is proposed to solve the problem of dynamic load variation in wireless power transfer system. The mutual inductance model of the system is established. The dynamic performance characteristics of the original receiver are deduced. The variation trend of the transmitting terminal current, phase Angle, resonance frequency and output power efficiency of the system under the dynamic load condition is analyzed. Finally, an experimental platform was built, and variable resistance load and motor load were used to test the system characteristics of different resistance values and motor speeds. The results verify the correctness of theoretical analysis.