The engineering characteristics of composite foundation with rigid-flexible and long-short piles are studied. By using the finite element method

the effects of cushion modulus

cushion thickness

short pile modulus

and long pile length on the total settlement of composite foundation

the stress ratio of long-short pile

and the axial stress of long-short pile are discussed respectively. The results show that the engineering characteristics of composite foundation can become more reasonable by optimizing material parameters; and long pile can effectively reduce settlement of composite foundation. Based on the in-situ measurement of pressures in soil and piles of a practical engineering in Wenzhou City

stress ratio of pile to soil and pressures in the process of construction are analyzed. Some conclusions are provided as references for future design and application of this kind of composite foundation.