Abstract: In order to study the application of real-aperture radar in the monitoring and early warning of open-pit mine landslide disaster, based on the three - stage theory of creep deformation, a real - aperture radar early warning model was established. The prediction method of landslide time was analyzed,and the monitoring displacement data of radar was extracted. The linear fitting method of the pearly warning model with the inverse velocity method under different Time Windows (TW) was discussed,and the rule of the prediction of landslide time was carried out according to the deformation velocity data after the Onset of Acceleration (OOA) before the pre - slip. The results show that, based on the three - stage creep theory of slope deformation,with the passage of the new Start Point (SP),the predicted landslide time is closer to the real landslide time. With the decrease of the time window,the landslide prediction time is constantly approaching the real landslide time. A smaller time window should be selected in the monitoring and early warning to improve the sensitivity of data display and the accuracy of landslide prediction time.