In connection with the section of reinforced concrete track beam varying significantly under the same mechanical load,two kinds of structural forms of the pile foundation track beam and the elastic foundation track beam are selected respectively under typical wheel pressure conditions.The numerical analysis is carried out by the large-scale finite element software STAAD.The results show that the cross section height of RC beam is an important factor of the internal force of track beam,and the internal force increases with beam height under the same condition.The proper height of section beam of elastic foundation is 0.4～1.0 m.The optimum beam cross section of pile foundation beam is mainly affected by pile spacing,and there is a minimum required beam height under the condition of wheel pressure and pile spacing,which can be used as the design beam height.