A 1000m shaft was submerged by underground gushing water at Dongguashan Mine in Tongling and the depth of water came up to 800m.After som e drain measures such as dumping waste rock in deep water and sealed bottom by g routing were performed,the sinking of the shaft was resumed,but in the process o f sinking,the existing drainage capacity failed to meet the requirement obviousl y.In order to minimize the gushing water in the shaft,a pre-grouting technology was used at working face to control underground gushing water,thus being able s moothly to complete the construction work of the rest 130m section of the shaft under more complicated hydrogeological conditions.