Rainfall infiltration can cause a decrease in the strength of the rock and soil mass on the dump slope,increase the bulk density of the upper rock and soil mass,and reduce the stability of the slope.This paper takes a mine dump slope as the background,and uses GeoStudio software to simulate and analyze the pore water pressure characteris-tics and safety factors under different rainfall durations.The simulation results indicate that as the duration of rainfall increases,the limit value of pore water pressure continuously increases,and the pore water pressure increases towards the top of the slope,while the corresponding safety factor decreases.The study provides references for the stability of the dump slope in the mine.