By using finite element software, the article comparatively analyzed the effect of super light material composite foundation with common material pile composite foundation. It found that super light material pile with the thick and short pile has obvious advantages, it is able to overcome the deficiency that pile and soil can''t coordinate deformation of rigid material pile with high modulus ,and also be able to overcome the deficiency that pile instability of flexible material pile with the long piles. This paper provides the evidence of treating soft soil foundation with the super light material pile composite foundation on the feasible of effectiveness and economic value.