Aiming at the low utilization rate of shore power equipment for ships waiting for lock in the Three Gorges Dam area，this paper analyzes the reasons to improve the existing shore power equipment.It designs a T-shaped interface box and an intelligent cable retracting and releasing system for pontoons，a shore power interface box suitable for ship berthing and mooring power supply，and a set of ship shore-based power supply system suitable for water level changes.This can solve the problems of difficulty in transporting power supply cables and obtaining electricity from shore for docked ships due to large water level changes.The implementation of the shore power system in the studied area mobilizes the ships enthusiasm to utilize shore power，significantly improves the efficiency of shore power equipment，and reduces air pollutant emissions.