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Wireless Power Transmission (WPT) and Electrical vehicle (EV) technology have been rapidly developed in recently decades.However Evs are not widely accepted by consumers because of the range anxiety resulted from battery bottleneck and the difficulty of convenient charging.Thus the dynamic wireless charging solution is reconsidered.Due to the power fluctuation easily brought by the coupling coils over large misalignment, a general design method of primary compensation network from the perspective of smoothing the transmission power versus the coupling coefficient k is proposed in this report.Under the premise of ensuring high transmission efficiency and soft switching, a novel three-element compensation network is presented which maintains a stable output characteristic over a wide misalignment, companied with an inherent current limiting ability under no-load operation.A 500W WPT prototype with fixed frequency control based on three-element compensation network is built.The output voltage is kept almost constant within 40 percentage of horizontal misalignment, showing the effectiveness of the proposed compensation network.