Abstract: The geosynthetic reinforced pile supported embankment is a new ground treatment technology developed in recent years. The advantages of this technology include reduction of number of piles, decrease of project costs and increase of construction speed. Finite element method is used to analyze the deformations in geosynthetic reinforced pile supported embankments under high-speed train loads. The influences of soft soil deformation modulus, elastic modulus of piles, elastic modulus of geogrid and the space between piles on the settlement of each part of the embankment and the maximum lateral displacement of the embankment are investigated. The results show that the four factors have effects on the pile settlement, the surface settlement of the filling soil, the displacement of the soil between piles and the maximum lateral displacement of the embankment.