Based on the background of water surge treatment for the right bank support body of a hydropower station in Yunnan Province, this paper introduces treatment of the special conditions of high-volume, high-pressure and high-flow water inrush encountered during deep hole curtain grouting with high-polymer composite water-blocking slurry (C-GT water-blocking slurry), which provides new material selection and treatment methods for the gushing water treatment in the karst area, and also reference for similar projects.