Abstract: In view of the problem of the coal recoveryon the open-pit mineslope with the fault and the weak intercalated layer from the viewpoint of controlling the slope stability，and combined with the engineering geological practice of southern soft rock slope in Shengli No.2 east open-pit coal mine,effects of different length of the coal pillar on slope stability were studied,the influence of the tracking distance of cross mining and the slope angle of cross mining on the stability of south slope are determined of limit equilibrium theory,numerical simulation and other means and methods.The results indicated that thefailure mode of slope in Shengli No.2 east open-pit coal mine is shear arc-bedding slip;The slope stability is less than 1.0 when the coal pillar is placed on the hanging wall of the Fault F8,and the longer the coal pillar is,the smaller the slope stability is;When cleaning the landslide mass on the hanging wall of the Fault F68 is less than 100 m,the south slope stability has been improved,but the change is small;Taking into account the problem of the needs and safety of the equipment layout space in actual development process of stripping and mining,and ultimately determining the tracing distance is 10 m and a working berm is setting in working slope of the cross exploitation and inner dumping.