At present, the columns of the column inspection pits in the parking garage of urban rail transit depots basically adopt the form of cast-in-place concrete structure，and a few adopt steel structure, column or precast concrete small column structure. Conventional column scheme has many construction operations, construction accuracy is not easy to control, construction progress is slow, and construction quality is difficult to control. It is difficult to meet the requirements of construction period, construction precision and aesthetics of urban rail transit. In this paper, the advantages and disadvantages of the conventional cast-in-place concrete column scheme, steel column scheme and precast concrete small column scheme in design, construction precision control, construction quality control and engineering cost were systematically investigated, and a precast H-shaped slab and column composite track structure scheme was developed. Compared with the conventional scheme, this scheme has the characteristics of simplifying operation links, reducing labor intensity, improving construction accuracy, improving construction efficiency and enhancing its aesthetics, etc., and realizes the structural assembly to the greatest extent, which provides a good reference and reference for solving the problems related to the inspection pit structure of the columns in the car depot parking garage.