In view of the shore-to-ship power supply under the large water level difference condition in the Three Gorges reservoir area,a new shore-to-ship power supply system has been designed based on pontoon which can adapt to water level change.The facility adapts to different water levels by floating the pontoon up and down in the guide frame and adapts to the power supply of the ship at different free board heights through the two-story structure.The radar water level gauge is used to obtain the water level information,which is transmitted to the frequency conversion controller of the cable reel.Through the logic edit of the control system,the accurate retracting and releasing of the cable can be realized when the water level changes.Through the analysis of the existing technology,the feasibility and scientific of this system are proved,which provide the theoretical support for engineering design.