For the structure foundation, under the soft clay layer conditions, the design charts are first presented for the evaluation of both bearing capacity and total settlement in the basic raft foundation system. Load settlement relationship curves are used to evaluate the ultimate soil bearing capacity. The total settlement is evaluated by applying various traditional safety factors into the ultimate bearing capacity. Then, the parametric studies are carried out for the piled raft foundation system. In the numerical analyses, the elasto-plastic finite element model (Mohr-Coulomb model) is used to present the foundation response and the design charts, which enable the determination of the raft size and pile length and spacing.