According to the existing problems of complex operation,potential safety hazard and inefficiency about the water supply and drainage system for ship chamber of Three Gorges ship lift,the structural characteristics and operation process of the system were studied.The docking device of the supply and drainage system was designed,and the stress of the device was analyzed,which provided theoretical guidance for the design and verification of the docking device.This paper put forward the installation and layout of two kinds of docking devices,and compared the advantages and disadvantages of the two schemes.At the same time,Three Gorges ship lift chamber supply and drainage technology was optimized.The results show that the designed docking device can improve the efficiency of shipchamber water supply and drainage and the safety of personnel operation,and realize the integrated operation of ship chamber water supply and drainage of ship lift,so as to provide guarantee for the safe operation of ship lift in the Three Gorges.