Based on the evolution pattern of slope deformation and failure, stability status of a slope is evaluated through analyzing the data of GPS monitoring. A neuralnetwork model of slope displacementtime is developed based on the GPS monitoring data. It can be used to forecast slope deformation trends. A neuralnetwork displacement prediction model of slope deformation is proposed with Matlab ANN toolbox. Upon a case study, the ANN prediction results based on GPS monitoring data are analyzed.