Due to the massive exploitation of coal resources,the phenomenon of land subsidence in Hegang area has gradually intensified,affecting the safe production and life of local residents. In this study,we took the Hegang coal mining area as the case study,collected Sentinel -1B SAR data of 59 scenes from August 31,2019 to August 20,2021,and used the SBAS time series InSAR technique to invert the land subsidence caused by coal mining. The spatial evolution process of land subsidence in Hegang coal mining area is analyzed. The results show that the deformation extracted by InSAR presents obvious non-uniform,irregular and funnel-like motion,the average surface deformation rate reaches a maximum of 370mm/a,and the surface uplift deformation rate reaches a maximum of 75mm/a. The 19 land subsidence funnels extracted by InSAR have the characteristics of discrete distribution,different shapes and clear boundaries,and are mainly distributed in Xing'an district and Nanshan district of Hegang. The main conclusions are as follows:① Hegang coal mining accelerates the surface subsidence movement. ②During the research period,since the formation of the settlement funnel relative to the first image,the spatial shape of the subsequent mining settlement funnel has remained basically unchanged. ③ The surface deformation of the working face where the No. 4 deformation point of the Fuli Coal Mine and Xing'an Coal Mine in the south of Hegang is still in a state of rapid subsidence requires continuous tracking.