Taking the design of No. 2 rainwater pumping station in No. 2 island of Beijing-Tianjin cooperation and demonstration zone as an example, the construction style, pumping station design, construction technology and operation mode of the project are introduced in detail. The pump room and detention tank adopt the complex style of vertical stacking. Combined with the characteristics of the project, open caisson construction method is adopted to save the project cost. Its design and construction will accumulate experience for similar projects and has certain reference significance.