Combined with the first phase of the Ningbo Xiehe wharf reconstruction project，this paper introduces the reconstruction and expansion design of a wharf that was idle after completion more than 20 years ago. After rechecking and analyzing the existing structure，it is believed that the safety level of the original safety factor method（K value method）and the current limit state design method remain the same overall. Combining with the current situation of the wharf，the mooring analysis is used to optimize the length of the reconstructed and expanded quay platform and the mooring piers arrangement. The upper structure of the wharf adopts the layout form of no longitudinal beams and variable thickness plates，which solves the problems of large regional differences in the process load of the working platform and complex layout. And the environmental protection problems are solved through oil pollution collection and transformation.