Abstract: In order to study the mechanical properties of a new geotechnical material curing light soil under the influence of changeable natural climate environment, the self -developed curing light soil is taken as the research object, and the change in the strength of the curing light soil of different densities with the number of drying and wetting cycles is simulated by controlling the change in moisture content. The curing light soil of different densities is carried on a single shear, pre -shear and multistage shear test by GCTS ring shear apparatus for researching the rule that the shearing mode changes along with c, φ and the residual shear strength. The experimental results suggest that under the drying -wetting circles, the curing light soil shows the obvious trends of attenuation and the stability in drying -wetting circles. The greater the density of soil is, the greater the rends of attenuation increase. The porosity of the soil shows a increasing trend and is steady with the increasing drying -wetting cycles. This explains the change trend of strength from internal mechanism. Under the large deformation, multistage shear has the greatest effect on the residual shear strength, the pre -shear second, and the single shear the lowest. The residual shear strength of the curing light soil is proportional to the density and normal stress.