Abstract: Through GPS monitoring in Shuichang iron mine, the location of monitoring points and the optimizing design of monitoring network were discussed. Based on 9 phases monitoring data of 6 monitoring points and field monitoring experience, rose diagrams in level displacement direction were mapped. The monitored result accords with the actual state of the mine. Compared with other ordinary monitoring instruments, GPS monitoring can satisfy the precision of an open pit mine's slope deformation monitoring completely.