Abstract: The slope slide and disasters happened frequently in Guxu Coal Mine which locates under high-steep slope overburdened by loose accumulative. Taking one coal mine for instance, which locates in Luzhou City of Sichuan Province, and based on the analysis of both the geological conditions and the mechanism and discipline of the slope formation, it concludes the stability analysis model based on imbalance thrust method. The calculation result shows that the ratio between anti-sliding area S_A and main-sliding area S_M under the limit equilibrium state is 1∶3.02. The similar simulation experiment shows that when S_A∶S_M<1∶3.02, the loose accumulative formation slides under the influence of the coal mining. When S_A∶S_M>1∶3.02, the loose accumulative formation keeps still under the influence of coal mining. The research indicates that using S_A/S_M ratio to determine the mining scheme is an effective way to control the slope sliding disasters which locates under loose accumulative formation.