Abstract: In order to study the macroscopic deformation of the slope at the left bank of Baihetan Hydropower Station in the micro-fracture damage state, based on the micro-seismic monitoring and field deformation data, the source radius was used to characterize the rock fracture scale, and the constitutive relation considering the scale of rock fracture was used to introduce the fracture information into the slope at the left bank. A three-dimensional numerical model was used to reproduce the unloading deformation process of the rock mass of the abutment at the left bank during excavation, and to establish a quantitative connection between microseismic damage and field deformation of the slope. The feedback analysis shows that the microseismic damage model is more similar to the actual displacement measurement under the excavation conditions. The proposed feedback analysis method considering microseismic damage is a preliminary exploratory work and can provide new ideas for the researches on the stability of high and steep slopes.