A new foundation treatment method is put forward in this thesis. The widened foundation was handled by the integrated application of rigid piles and vertical geotextile material. For investigating the performance of widened embankment under the embankment loads with the direct connection method on soft ground improved by application of rigid piles and vertical geotextile material, a 3D elastic—plastic finite difference model was established in FLAC3D. Through using numerical analysis, the settlement of widen embankment, lateral deformation and stability of the foundation were investigated from reinforcing or not. The results show that the comprehensive application of rigid piles and vertical geotextile material can effectively control the lateral deformation of foundation soil, thereby reducing the different settlement between the new and old embankment and surface, the reinforcement effect is obvious.