The lightweight treated soil （ LWTS ）, a new type of light weight geo-material （ LGM）, has advantages such as light weight, high strength and environment protection et al.. The mechanics properties of two type of the LWTS mixed with different foamed plastic beads are researched by the uniaxial compression test, the isotropic compression test and the triaxial compression test. The results show that the type of beads has greater effect on the mechanics properties of LWTS.