Due to high temperature,rainfall and large wheel pressure load,damages occur in port roads of south China area.The bearing capacity of pavement base determines the performance of pavement in port.Considering the deep soft properties of soil,the pavement base reinforced with geogrid is simulated with finite element method.The result shows that the results of the pavement base reinforced with geogrid simulated by finite element method correspond with the results of field section;There is an inverse relationship between the deflection and the ultimate load.The smaller the deflection,the larger the ultimate load.It indicates that geogrid is capable of improving the bearing capacity of pavement base,and the effect is better when the grogrid is placed near the surface layer.