Abstract: In this paper, through the combination of measured data and theoretical analysis of goaf, the important buildings above the mining area are selected to set up monitoring points, including the buildings that may have uneven settlement after emergency treatment and the buildings with large settlement screened by InSAR calculation for automatic settlement monitoring. Automatic monitoring equipment was used to observe the elevation and ground subsidence changes of monitoring points in real time, and analyze the subsidence changes, the trend and trend of curves, and the damage degree of the stress changes to the attached objects. Then set alarm value for building settlement monitoring and analyze whether there is overalarm in monitoring data. Monitoring and analyzing the subsidence law of mined-out area is helpful to better guide the mining of mined-out area and the secondary development and utilization or backfilling of mined-out area, providing safety analysis for production activities and living above the mined-out area.