The reinforced concrete piles (RC) in integral abutment bridges (IAB) are challenging to meet the longitudinal deformation of bridges with significant lateral stiffness. This paper proposes a new form of pile comprised of UHPC and RC piles in series to meet the longitudinal deformation demand of IAB. Test were conducted for two UHPC/RC segmental piles (with or without prestressing) The failure characteristics, hysteretic behavior curves, skeleton curves, equivalent viscous damping ratio, and rigidity degeneration were developed using horizontal displacement loads, The results show that prestressing can effectively improve the resist cracking ability of step piles and seismic properties, while meeting the deformation requirements of IAB. The finite element model (OpenSees) was used for modeling and analysis, The analysis shows that the horizontal bearing capacity and deformation capacity of stepped pile can be improved by the increase of prestress degree, the ratio of length and stiffness of pile.