Gravity quay is a type of quay structure that is widely distributed and used in our country. It relies on the gravity of the structure itself and the filler on it to maintain its anti-slip stability and anti-overturning stability. For the gravity-type quay in the strong earthquake area，in addition to the general static effect during construction and use，it must also withstand the inertial force，active earth pressure，hydrodynamic pressure，etc. generated by the seismic. Especially，when the water level is high，the backfill behind the gravity quay wall is in a saturated state，and strong seismic action will generate excess pore water pressure. Therefore，the seismic design of the gravity quay is very important. This paper compares the seismic effects of gravity wharves in major domestic and foreign codes. For a gravity quay in a proposed port area in North Africa，my country’s Seismic Design Code for Water Transportation Engineering and PIANC’s Seismic design Guidelines for Port Structures are used to compare and analyze the stability of the quay at high water levels under earthquake conditions.