The lightweight geomaterial mixed with EPS beads (abbreviated hereafter as LWGME), a mixture of superlight EPS beads and normal geomaterial, is one of the geoform. LWGME can use construction generated soil as base material. Therefore, construction generated soil leads to restraint and reuse of construction generated soil which is a problem in recent years. However, LWGME contains EPS beads of high compressibility, it is pointed out that is shows different mechanical characteristics from normal geomaterials. Therefore, grasp of mechanical characteristics is one of the important index for safer designs and constructions. This study, as a part of our studies to make clear the design parameter and the prediction equation of LWGME used for subgrade, to find out the mechanical characteristics of LWGME, conducts the unconfined compression test, the unconsolidated undrained shear test, the resilient modulus test.