Abstract: Aiming at the problems of high slope monitoring accuracy of open-pit mines，high real-time performance，difficulty in comprehensive coverage，and difficulty in contacting，the technical characteristics of ground-based SAR measurement were analyzed，and the monitoring method of high slope deformation in open-pit mine based on ground-based radar and the key technologies of atmospheric disturbance correction and time sequence analysis were studied.Combined with the deformation monitoring experiment of Sanyou Mine slope，the processing flow of ground-based radar data and the method of radar data quality evaluation based on amplitude discrete index，estimated stability index，displacement accuracy and other parameters was given.For the atmospheric disturbance problem in long-term and long-range monitoring of open-pit mine slopes，explored the atmospheric correction method based on the PSC network，and achieved good atmospheric correction effects.The monitoring results were consistent with the monitoring results of the high-precision measuring robot，which verifies the effectiveness of the monitoring method.The study results show that the amplitude dispersion index is better than 0.1， the phase estimation stability index is greater than 10，and the displacement accuracy is better than 0.2 mm.PSC network atmospheric correction can effectively eliminate the phase change caused by temperature difference between day and night and humidity，and achieve sub- millimeter measurement accuracy.The micro deformation monitoring of high slope in open pit is realized based on time series analysis technology，which provides a new monitoring method for mine slope safety.

Key words: open-pit mine, ground-based synthetic aperture radar, slope deformation monitoring, atmospheric correction