Research results: In the excavation engineering construction, we can assure safety in construction of pile. By grouting midst pile out enclosing,*can assure safety认construction of excavation construction. When the excavation work to water structure, we can prevent water burst and bulge out of the fondue through making the grouting water stop purdah on the fondue. After the excavation is finished, there usually exists more or less leakage water middle the pile sod we increase water stop standard and reduce the pump water charge through fathering the leakage water of the pile middle.