In view of the connection design between different structures of quay wall wharf under complex geological conditions，this paper studies and analyzes the structure selection of quay wall wharf under complex geological conditions and the key technology of connection treatment between two adjacent structures with large difference in berth grade based on actual engineering，which can solve the problems of superstructure cracking and sand leakage in structural joints，caused by different settlement at the connection of different structures of quay wall wharf.This paper summarizes the pile stabilizing and rock-socketing technology of composite steel sheet pile structure at the corner joint of quay wall wharf with large difference in berth grade，which has a certain reference value for the design and construction of similar wharf engineering.