Abstract: Frost heave has caused serious damage to railway roadbeds in seasonal frozen regions. Therefore, frost heave prevention is the basic principle of roadbed design in seasonal frozen regions. It is a rigorous task because of the strict demand of the deformation in high-speed railway. The heat transport equation and two-dimensional finite element method are employed to simulate the maximum frozen depth in the coming 50 years. The simulation consider the warming environment temperature in the conditions of different depths, shapes, filling materials, and construction seasons. It studies the roadbed temperature field of different parts in high-speed railway. Based on the numerical simulation, appropriate depth, shape, filling material and construction season are proposed for exchange filling material roadbed design. The relationship between the railroad and the railway thermal stability is analyzed as well.