Abstract: Dynamic wireless power transfer(WPT) needs to switch different transmitting coils according to the real-time position of the vehicle. It is one of the most important parts to ensure the dynamic WPT working in a proper state. In order to realize the real-time site detection of vehicle, a dual-channel dynamic WPT system is presented in this paper. One channel is power-transfer channel which is used to transmit the electric power. The other is site-detection channel which is used to detect the site of vehicle in real time. To research the mutual interference between the two channels of WPT system, a four-coil coupling model is presented and a strategy to reduce the interference is proposed. Then the frequency of the side detection channel is selected and the fine-detuning strategy is proposed. By applying the fine-detuning strategy, the current flowing in the transmitting side of site-detection channel decreases under the no-load condition. Moreover, the performance of the channel will not be significantly affected. Through theoretical analysis, simulation and other means, the strategies proposed in this paper are proved to be valid, and the research content is supported by experiments.