Abstract: After the closure of the mine,due to the influence of various factors such as stress between rock masses and groundwater,the structure of underground rock layers and soil layers in the mining area has changed,resulting in secondary morphological changes on the surface of the goaf.To explore the pattern of surface deformation after mine closure,SBAS-InSAR(Small Baselines Subset InSAR)technology was used to process image data and obtain surface deformation information of the closed mine in Haizi Mining Area,Huaibei City for 5.5 a.Through the analysis of image results,it is indicated that there are 2 obvious subsidence areas in the mining area,distributed in the eastern and southwestern parts of the mining area,with a maximum subsidence rate of 25 mm/a and a maximum subsidence a-mount of 124 mm.Based on previous research by scholars on residual subsidence in closed mine areas,it is speculated that the reasons for its subsidence may be related to factors such as coal seam mining depth,underground water accumulation damaging coal and rock pillars,and surface water accumulation.At the same time,there is a signifi-cant uplift in the central area of the mining area,It is mostly concentrated in Qiji Town and its surrounding area,with a maximum lifting rate of 18 mm/a and a maximum lifting amount of 133 mm.It is speculated that the reason for the lifting may be related to the rise of groundwater and the gravity loading of buildings.It is speculated that groundwater flows into the underground of residential areas,causing the rebound of fractured rock masses,and the gravity of build-ings accelerates this process.The more obvious the lifting in areas with concentrated buildings.After about 4 a of sub-sidence in the mining area,the surface subsidence tends to stabilize,while in residential areas,the surface gradually tends to stabilize after first subsidence and then uplift.Selected characteristic points from the most significant areas of surface deformation and conducted a more detailed analysis based on factors such as coal seam depth,ground-water,and building gravity.Based on the deformation characteristics,the surface deformation over time can be divided into 3 stages:residual subsidence stage,relatively stable stage,and uplift stage;Based on the annual deformation are-a changes in the surface of the mining area,it can be concluded that during the monitoring period,the overall uplift ar-ea of the mining area has increased year by year,while the proportion of subsidence area has gradually decreased.Therefore,it is speculated that the uplift area of the mining area has reached its maximum uplift amount,but the uplift range will further expand.