Based on the assumption that geogrid and its surrounding soils are a composite material
the effect of reinforcement of dam crest rockfill with geogrids is studied using nonlinear elastic finite element method. The influence of layer number and modulus of geogrids on effect of reinforcement is investigated. The results indicate that reinforcement is helpful in increasing stability and earthquake-resistant ability of dam crest rockfill. It also shows that effect of reinforcement becomes more evident with more layers and large modulus of geogrid.