Most transmission lines pass through remote areas in mountainous regions and are affected by geological hazards. The tower will be affected by surface deformation will occur tilt, uneven settlement, horizontal slip and other damage, directly threatening the safety of the tower and the stable operation of the line. Therefore, it is of great significance to study the influence of surface deformation on transmission tower construction and operation under complex surface conditions.

     Interferometric Synthetic Aperture Radar (InSAR), with its high resolution, wide range monitoring and millimetre accuracy of deformation, can scientifically and effectively detect the hazards posed by surface deformation to power transmission towers.

     The article aims to study the deformation information interpreted from the average deformation rate and deformation time series results, relying on the 86-view Sentinel-1A IW（Interferometric Wide）SAR（Synthetic Aperture Radar）ascending orbit images and terrain phase simulation data, to realize the transmission channel time series deformation monitoring. The main contributions are as follows: First, the time-series InSAR deformation monitoring technology is based on the SBAS-InSAR(Small Baseline Subset InSAR) technology, and the SBAS-InSAR deformation rate as well as the deformation time series are calculated on the basis of data preprocessing and differential interference processing, so as to obtain the geocoding deformation monitoring results. Secondly, based on the deformation rate of the monitoring area and the deformation time series near the tower, the deformation of the lighthouse in the deformation influence range is analyzed.

     In this paper, a 500-meter buffer zone along the transmission channel is selected as the monitoring area in Meigu County, Liangshan Yi Autonomous Prefecture, Sichuan Province. A total of 86 Sentinel-1A IW SAR orbital ascent images from January 2017 to December 2019 were collected in the experiment. AW3D DSM (ALOS World 3D Digital Surface Model）data with spatial resolution of 30 meters and elevation accuracy of 5 meters were collected. The analysis results of the method in this paper show that the average deformation rate in the monitoring area ranges from -160.5 to 76.5 mm/a. In the east of the monitoring area, there is an obvious large-scale ground deformation area near P18 and P19（P18 and P19 indicate the positions of pylon 18 and 19）. The average deformation rate is above 70 mm/a, and the two towers P18 and P19 are located in the influence range of the deformation area. Extracting the time series of deformation near each tower, most of them show no significant deformation and an overall smoother trend, while P4（P4 indicate the position of pylon 4），P7 (P7 indicate the position of pylon 7），P18 and P19 have a more significant deformation trend. P4 points showed a linear deformation trend on the whole, and the cumulative deformation was about 70 mm. P7 was stable on the whole, but showed a sudden increase in deformation trend in the middle of 2019. In addition, the cumulative deformation of P18 and P19 in the influence area of the deformation region reached 130 mm, and the main deformation occurred in 2017 and the first half of 2019. In general, there is an obvious large-scale deformation area in the eastern part of the transmission channel, and it has certain influence on the nearby pylons. Therefore, it is necessary to conduct field survey or long-term monitoring for risk assessment, so as to realize the safe operation of the transmission lines. In this paper, the SBAS-InSAR time-series deformation solution of 86-view images was used to analyse the average deformation rate results and deformation time series results of the monitoring area, and surface deformation areas were found, and obvious deformation areas were also found around transmission line towers, which verified that InSAR technology can be used for surface deformation monitoring of transmission channels under complex ground conditions.