Abstract: An convex slope with three unconstrained sides is formed in the northeast of Baiyinhua open-pit mine due to mining reasons. The stability of the convex slope seriously affects and restricts the safe and efficient production of the open-pit mine. In this paper, GPS field monitoring and three-dimensional numerical simulation are combined to comparatively analyze the deformation stability of the convex slope under mining conditions. The numerical simulation results are in good agreement with the field monitoring data. The influence of the south side backfilling and the north side mining on the deformation of the convex slope is further studied. The research shows that the deformation of the head of the convex and the bottom of the slope is large,and the convex slope does not produce obvious penetrating shear deformation. With the back filling of the south side of the convex slope and the mining of the north slide, the deformation of the front end of the boss slope decreases gradually,and the main deformation area will move to the east side of the convex slope.In this paper the stability of slope is evaluated effectively and timely,and the treatment of slope deformation can be referenced. The work presented in this paper can effectively and timely evaluate the slope stability and provide a reference for the deformation control of the slope.