Abstract: The end-slope stability of surface coal mine is the main influencing factor of affecting the coal recovery beneath the end-slope.Both of ensuring end-slope stability and recovering coal resources beneath end-slope to the great limit meet the development goals of safety production and economic efficient of surface coal mine.In order to solve the problem in recovering coal resources of easily-sliding end-slope in open-pit mine，and based on the theory of timeliness and steep end-slope mining，two new mining methods of cutting steep end-slope in vertical and parallel were proposed.Basic modes of determining cutting end-slope width were also analyzed.Taking one surface coal mine in the south of our country for example，end-slope stability with different width of cut mining were analyzed by using FLAC3D numerical simulation software.The result showed that stability of cutting steep end-slope in vertical decreases with cutting width increasing，and the cut steep end-slope mining can greatly reduce the risk of slope instability and effectively recover residual coal resources of easily-sliding end-slope compared with the all-width steep end-slope mining.The analysis of slope stability improved the related theory of timeliness end-slope mining to a certain extent.

Key words: Open-pit mine, End-slope, Steep end-slope mining, Stability analysis