For the seismic design of slope engineering in strong earthquake areas,the displacement analysis methods are adopted widely in the international standards or guidelines.Due to the complexity of the earthquake,it is important to choose appropriate calculation method for displacement estimation.Based on the problems,this paper compares the several simplification methods for displacement calculation commonly used in international standards and manuals,including Ambrasys & Menu formula,Jibson formula,NCHRP 611 formula,Bray and Travasarou formula,Makdisi & seed method,and Shang-Yu Hsieh & Chyi-Tyi Lee formula.In addition,the SLIDE software is used to verify the advantages and disadvantages of different simplified calculation methods.Furthermore,combined with the characteristics of seismic waves,an equation for the slope residual displacement based on Arias intensity is proposed,and a simplified formula is fitted by using the results of displacement analysis of several groups of seismic waves and different geological slope heights of a project in Manila.The conclusions of this paper can provide reference for the simplified method of seismic slope displacement calculation under similar conditions.