Abstract: The slope landslide disaster is a common problem in mining work of open-pit coal mine, especially the high frequency of landslide has brought huge impact to safety production. First of all, the paper adopts GPS monitoring method to monitor a surface mine stope, non-working slope and dump, obtains that displacement variation and variation amplitude in the mining area is the largest, non-working help takes second place, and dump is minimal, and determines that its landslide model is composite circular sliding. Then, the paper used FLAC^3D program to calculate shear-strain rate, shear strain increment, displacement and velocity vector of the engineering. The calculated results are compared with GPS monitoring results, and they shows that the results of the two methods are unified.