This paper focused on the improvement of the current pile-supported embankment calculation model from three aspects: soil arching effect，geotextile deformation and pile-soil load transfer due to the deficiency of the embankment- reinforcement- composite pile foundation interaction model. Firstly，considering the influence of foundation stratification, buried depth and overlying load on pile-soil load transfer，the vertical deformation function of pile and soil was derived. Secondly, the empirical model of the membrane effect was introduced to analyze the influence of the lateral deformation of the embankment and the foundation on the tensile force of the geotextile. Finally, based on the soil column model, this paper analyzed the relationship between load distribution and differential settlement at the bottom of the embankment in consideration of the influence of relative displacement on the interface friction. On the basis of the above work, the improved model of embankment, geotextile, pile and inter-pile soil interaction was established on the premise of the equal relationship between pile-soil settlement and load distribution，from which the calculation method was deduced of pile-soil stress ratio of pile-net composite foundation under the embankment. The rationality of the method mentioned was validated by practicable engineering examples.