Abstract：In the process of optimal design of foundation reinforcement for the typical project，by means of finite element analytical method，systematic calculation and analysis have been conducted aiming at raft foundation and foundations reinforced by short pile，long pile，and long-short composite pile respectively. Under the same loading condition，the load-deformation curve of foundation reinforced by short piles approximates to that of natural foundation；and the load-deformation curve of foundation reinforced by long-short composite piles is similar with that of foundation reinforced by long piles. The changing rules of settlement distribution at central cross-section of foundations and at depth of 5 m are same as those of load level-settlement curves. The intensity and range of extensive area of plastic points，which centralizes in the upper soil layers，of foundation reinforced by short piles is similar with those of natural foundation. For the foundations reinforced by long-short composite piles and long piles respectively，the plastic point develops further down to bearing layer；and the distribution and magnitude of the foundation counterforce in the two cases are similar.
