The mechanical properties of geogrid-reinforced embankment including tensile membrane effect, the compositive friction between the subgrade soils and geogrid and the reaction modulus of reinforced composite soils were studied in laboratory test. To investigate the effect of the application of geogrid-reinforced embankment, some bridge-approachs in Shanghai Outer-ring Road engineering were chosen to test. It is shown that settlement and the earth pressure on the top of the foundation decreases greatly after using geogrid-reinforced embankment, and the settlement after construction on the road surface also becomes quite small. The result indicates that the use of geogrid-reinforced embankment could reduce the bumping at the bridge-head distinctly.