Creep of geogrid is an important property which affects its application in permanent reinforced structures. At the present time, most of the creep tests are carried out under unconfined conditions which were obviously different from the actual status of geogrid used in geotechnical engineering structures. A series of confined creep tests on HDPE (High Density PolyEthylene) geogrid are carried out in granular soil. The relation between creep deformation and time is obtained under different vertical pressures. The results show that the confined creep strain are smaller than that obtained by common unconfined creep tests. Sand confinement  could remarkably reduce the creep of geogrid.