Abstract: In Xinglongzhuang coal mine,a second destroy has happened in west wind shaft after five years,which is due to the stratum subsidence of Quaternary because of mining.According to the analysis,composite technique of grout chemistry slurry injection is adopted.With the flow,coagulate,split and fill of slurry,the crack is jammed and the aim of controlling water,strengthening shaft and preventing subsidence is reached.