Abstract: According to the characteristics of a high and steep slope in Changba Lead-zinc Open-pit Mine,a slope monitoring project was selected,which is chiefly by GPS,secondly by leveling instruments and crack instruments.Designing and construction of the monitoring system were introduced in detail.Monitoring data of the 1 500 m step of the north wall slope were taken for example to analyze the deformation law,and synthetic monitoring results of the north wall slope were evaluated.The results show that the stability of the north wall slope between B03 and B06 is the poorest,its maximum displacement reached 231.1 mm in nearly 600 d,and slip rock mass may exist in the segment slope.The displacement rate curves display an obvious S-shape,and the convex segment shows an acceleration deformation stage by rainfall in rainy season.Accumulated deformation of cracks can be divided into three stages: early relative stable stage,middle deformation triggering stage and the third stage stable deformation duration.Monitoring data indicate that the displacement of the middle 1 500 m step slope is greater than any others,and its stability is the poorest.The application effect of the monitoring system is significantly,which is one of important methods for displacement monitoring of high and steep slopes.