Abstract: Combined with the in-situ test results of the piled embankment with deep soft foundation at the bridge-head of expressway, several axisymmetric finite element numerical modeling methods for single pipe pile in composite foundation are compared and verified. It is considered that the axisymmetric contact finite element model can accurately reflect the basic properties of the pipe pile composite foundation under embankment. The mechanical characteristics and deformation distribution of the piled embankment composite foundation are discussed in detail based on the numerical analysis results. The numerical calculation results show that the higher the fill is, the more prominent the stress concentration is at the top of the pile cap. The pile-soil stress ratio and the ratio of embankment height to pile spacing, as well as the settlement difference between the pile and soil, shows that there have the relatively good positive linear relationships. At the end of embankment filling, 80% of the embankment load is carried by the pipe pile with the cap, and more than 90% of the load on the cap is undertaken by lateral friction resistance of the pile. Most of the load is transferred to the deep foundation with relatively low compressibility compared with surcharge on the natural foundation, and the additional stress distribution of the rigid pile composite foundation is optimized, both of the compression rate and compression of the foundation are significantly reduced within the length of pile. The total settlement of pipe pile composite foundation is only 18.5% of the corresponding natural foundation with the same load, and the total settlement of the deep soft foundation is reduced by 435 mm.