Abstract: In order to improve the recovery efficiency of coal resources at the end wall of Hongshaquan open-pit mine, to avoid the waste of coal at the end wall. Taking the west end wall of the first mining area in Hongshaquan open-pit coal mine as the research object, by combining with the principle of the highwall mining system, the width of supporting coal pillar and isolating coal pillar were studied, and the slope stability of the west end slope under natural working conditions and the condition of the end shearer with coal pillar were analyzed as well. The results show that the width of supporting coal pillar is 5.5m and isolating coal pillar is 27.3m by the calculation formula given by Mark-Bieniawsk. The stability coefficient of the west end slope is 1.957 under natural working conditions, and 1.805 after excavation with the highwall mining system, but both of which meet the requirements of the open pit design code. Hongshaquan open pit Coal mine has the conditions to use the highwall mining system, which can solve the problem of coal mining with end wall covering.