With the development of the national high-speed railway construction, the construction number of high-speed railway stations is constantly increasing. When the high-speed railway station house is implemented before the underground garage, the construction of foundation pit of underground garage must ensure the construction space and structural safety of early implemented station house. The basic situation of Pizhou Railway Integrated Hub is analyzed, and the enclosure of underground garage is discussed. Finally, the double-row pile enclosure scheme is determined. By analyzing the influence of different pile lengths, pile diameters and pile spacing on the lateral displacement of pile top, the appropriate parameters of retaining pile are determined. The practical application result shows that the double-row piles meet the engineering needs of underground garage and can provide a good reference for similar projects.