At the same time, the method of light well point precipitation is also used to decrease the groundwater level, which can ensure the slope stability of foundation.

For the sandy soil foundation with not large drop depth it generally selects to use light well drop, so it can meet the requirement of safety, adaptation and economy.

The paper takes the drainage of foundation pit in Liangke drainage gate of Tailai county as the example, introduces the layout of well point, the selection of equipment and the implement process.