A comparative study was made on seismic design of port and harbor structures based on the Chinese code, US guidelines and Japanese standards as well as guideline of International navigation association.This is the fourth of the series papers and briefing the methods of design of gravity type quay wall and sheet pile bulkhead. It is shown that, for the design of gravity type quay wall, the seismic coefficient is height-dependent in Chinese code and deformation-decisive which is based on analysis of seismic hazard in Japanese standard. For the design of anchored sheet pile bulkhead, the method for computing tie rod force and moment in sheet pile are different in these codes.