Abstract:The stability of high and steep rock slopes has always been widely concern by scholars at home and abroad. It is also one of the most important geological disasters in recent years, especially the high and steep rock slopes under complex geological conditions. If manual excavation is involved under such conditions, the stability and water conductivity of the slopes will change significantly. Under this condition, the stability of high and steep rock slopes of three sections of a tailings pond under complex geological conditions is studied by using 3DMine, FLAC3D numerical simulation software, origin post-processing software, and indoor rock mechanics test. The research results show that although there is a maximum shear strain at the bottom of the slope at sections I-I and section ii-ii, their safety factors meet the requirements of the specifications, and their slopes are in a stable state, And the maximum principal stress of the slope surface is distributed around 0.1 MPa, and no obvious stress change will occur. The research results provide a scientific basis for the construction of the tailings pond and the maintenance of the slope in the future and can provide a good safety warning for the geological disasters of the tailings pond slope.