Both sides’supporting structures of Shajing pumping station foundation pit include bored piles and three rows prestressed anchorage cables. The size of the foundation pit is 220 m long and 68 m wide. The average excavation depth of the foundation pit is 11 m, so it’s a large deep foundation pit. The pit is on the soft base, and underground water level is 1.2～2.5 m. This paper mainly introduces the hole formation method of the prestressed anchorage cable in the large deep foundation pit with a high water level, analyzes the issues of water and sand gushing, and proposes the methods including improvement of the construction platform’s level and the position and increment of slurry’s density to solve the problem of water and sand gushing. The methods have been verified by actual construction to be effective and feasible.