To counter the spatial issues of pile foundation design for complex pile-supported structure and lack expression of traditional geological data, we establish the pile information database for digitally and visually managing piles to facilitate design work. By coupling 3D piles model and strata-graphic model, we achieve several visual-aided design functions, such as reconstruction of piles and strata, collision detection and optimization of piles layout, selection of pile bearing stratum, calculation of pile length and axial bearing capacity, and automatic output of piles layout in 2D. The successful application of the technical solutions has improved the efficiency and level of pile foundation design for complex pile-supported structure.