Abstract: Due to the damage of wharf structures caused by earthquake-induced permanent slope deformation, permanent slope deformation checking has been an important portion of seismic design for the wharves. Among various methods for calculating the permanent slope deformation, the Newmark rigid block displacement method has been widely utilized for its simplicity. The extensive empirical Newmark sliding block displacement equations, which are usually applied to regional-scale seismic landslide hazard analysis but not aimed to specific site, have been proposed based on natural strong-motion records in recent years. Targeting at the design response spectrum in the “Code for Seismic Design of Water Transport Engineering”, a set of artificial earthquake waves corresponding to different sites and peak ground accelerations are generated. Sliding block displacements under different yield accelerations and corresponding to various peak ground accelerations and sites are determined through double integration of portions exceeding yield acceleration over the acceleration time histories, and an equation for the sliding block displacement evaluation is put forward by regression analysis. In addition, based on the overseas codes and standards related to the wharf seismic design, the recommendation limitation under different precautionary intensities for the sliding displacement of the wharf slope is proposed, which can be taken as a reference for the wharf seismic design in China.