Introductions of GPS(Global Positioning System) are made.The introduction consists of the main structure of auto displacement monitoring system

the theory of displacement monitoring and the method to improve the accuracy of observation.Furthermore

GPS is applied in one high mine slope for the displacement monitoring

which consist of the monitoring system

monitoring mode and monitoring steps.At last

the analysis of monitoring results shows that GPS technique has very high precision.In the engineering applications

it is not restricted by the weather conditions as well as its high degree of automation.The potential failure place of slope and the failure time can be predicted by the displacement monitoring of GPS

and the data provided by GPS show that the deformation velocity of slope is 0.247-0.560 mm/d

which is under the safety limit extension 10.0-20.0 mm/d

so this slope is in the stable state

and the safety of production is guaranteed by the application of GPS.