Abstract: According to the landslide deformation curve, the deformation stage usually is divided into initial deformation stage, constant velocity deformation stage and accelerated deformation stage. On the basis of these three stages, the scholars proposed to use the parameters of deformation rate, acceleration, acceleration jerk and displacement tangential angle as early warning criteria for landslides. But the monitoring data acquired lag makes a certain impact on the accuracy of the forecast just before sliding landslide. Global Navigation Satellite System (GNSS) integrated displacement monitoring machine can obtain the landslide real-time displacement, thus calculating the deformation rate of landslide. Taking the Landslide of G108 section in Zhouzhi County, Shannxi Province as the case, firstly using the displacement rate ratio to qualitatively evaluate the stage of landslide, and through the analysis of the displacement curves of seven typical landslides, it is found that rate ratio can well reflect the stage of the landslide. On the basis of qualitative analysis, the instantaneous deformation rate was proposed. We calculate the instantaneous deformation rate at a certain moment by using real-time monitoring data, and continuously update the instantaneous deformation rate with the updating mechanism. Engineering practice showed that this method can clearly reflect the state of landslide and has certain reference significance for critical sliding prediction of landslides.