Abstract：By investigating the influence of hydraulic pressure on the deformation of north side slope of Fushun open cast，the slide and inclination deformation mechanism of high steep slope in the area W200-W600 are presented，as well as the evaluation of effect of reinforcement for anti-slide pile and dewatering. The results show that most of the maximum deformation appears in layers No.1 and No.2，and the deformation decreases greatly after being reinforced. Otherwise，the slide depth will get into layer No.5 and this will lead to the slide of the whole layer No.5. Finally，some practice effects are introduced and it can provide references to the prediction and control of failure and instability of the similar slopes.
