Based on nonlinear finite element method, the character of expressway widened engineering reinforced with geotextile is studied. It is found that the main vertical settlement, lateral displacement and failure surface of embankment occurred in the widened part of embankment. The lateral displacement decreased, the total incremental of displacement reduced and the stability of embankment enhanced when expressway widened engineering reinforced with geotextile. It also can be found that the axial force of geotextile get its maximal value at the intersection of old and new part of embankment, which is controlled by the differential settlement and normal stress mainly. In order to reinforce the embankment effectively, it is advised that the geotextile should be paved on high-stress zone.