Abstract: The Pseudo-static method is one of the common methods to evaluate the stability of seismic slopes, and the selection of seismic coefficients in the quasi-static method is directly related to the accuracy of the evaluation results. However, there is a lack of unified standards for the selection of seismic coefficients, and there is a lack of solid theoretical basis to ensure their accuracy. Based on the shear beam theory, this paper derives the seismic slope response acceleration formula for right-angled trapezoidal slope, analyzes the influence of various factors on the slope response acceleration, and determines the recommended seismic coefficient values under different seismic intensities. When the seismic intensity is finally determined to be Ⅵ., Ⅶ., Ⅷ., and ⅸ., the recommended values of the corresponding seismic coefficients are 0.04, 0.07, 0.11, and 0.21, respectively. The results can reflect the dynamic response characteristics of the slope, and provide scientific theoretical support for the selection of seismic coefficients.