Abstract: With the wide mining of coal seam with large inclination, failure at roof and floor of stoping roadway sig? nificantly affects the safety of mining construction. Based on the six stoping roadways of five mining areas in southwest China, site test was conducted by a geological radar on the loosing circles at roofs and two sides of six stoping roadways with large inclinations, simulation and analysis were performed by 3DEC software regarding the mode of rock mass failure and plastic zone of failure, an areal map of loosing circle of stoping roadway with large inclination was drawn by taking the measured data into consideration, and the support scheme of stoping roadway was optimized. The results show that it will effectively control rock mass failure of stoping roadway and reduce the failure scope at floor and two sides with the scheme of“anchor bolt+ anchor cable+ steel strip”, guaranteeing the safety of mining construction.