Abstract: The ecological restoration of coal gangue hill is a complex systematic engineering, which should not only consider the ecological restoration and management, but also take into account the long-term stability of the slope under complex natural conditions. Based on the engineering background of the gangue hill in Dishan village, this paper puts forward the key technical measures of ecological restoration and slope treatment in view of the existing environmental pollution and slope stability of the gangue hill. In this paper, the safety factors of gangue hill slope under three working conditions of natural, earthquake and rainfall are compared and calculated by using Lizheng slope stability analysis software. Midas GTS NX finite element simulation software was used to compare and simulate the displacement and stress fields of dangerous sections under natural and rainfall conditions. The calculation results show that the deformation range of gangue hill slope is mainly in the surface layer and coal gangue layer due to the influence of slope structure. With the time lapse, the subsidence of slope top and uplift of slope foot are accompanied. Under the natural condition, the gangue slope is in a stable state. Under the conditions of earthquake and rainfall, the safety factor of gangue mountain slope decreases obviously, which indicates that the natural conditions have certain influence on the stability of slope. Compared with the calculation, it is found that the deformation under rainfall condition is the most obvious, and the monitoring should be strengthened in the rainy season.