Abstract: Due to the decrease of coal resources,more and more urban land turn to subsidence area,so its reclamation is the most pressing thing.Taking one main underground mine as subject,analyse the matters needing attention from the aspect of well location,drilling equipments,drilling methods and technology,detection of slurry component and parameter,leaking stoppage measurements for wall protection.Based on the analysis of drilling purpose,methods and location,analyse the pavement construction of No.1 and No.2 drillhole.The surface subsidence could be monitored by drilling exploring three zones.