Abstract: The mixed light-weight soil blended with steel slag is a new filling materials (LSBS) provided by the author, and uniaxial consolidation compression tests are conducted to study the stress-strain characteristics of LSBS and influence behaviors by mixed steel slag ratio and different ages. Furthermore, the effects of mixed steel slag ratio and different ages on the deformation modulus are observed, and the relation between settlement deformation and age is also investigated. Direct shear tests are conducted to study the influence behaviors on shear strength by mixed steel slag ratio and different ages, and the relation between shear strength and vertical stress is also analyzed. Some conclusions are drawn that the stress-strain exhibits elastic-plastic properties, the shear strength and deformation module basically change, and they become higher with the growth of the age. With the increase of the age, the steel slag cement shows water action and presents cement characteristics. The curves of shear strength and vertical stress agree with the Mohr-Coulomb theory. Indexes of shear strength are offered, and this study may provide reference for engineering application.