The experiments of soil-water characteristics curves are made under different consolidation pressures for sliding zone soils of Gushubao landslide in the Qingjiang valley

with an advanced unsaturated soil shear instruments which can control suction. The experiments show clearly the influences of consolidation pressure on the soil-water characteristics curves. The varied consistent functions have been established from the experiment data of soil-water characteristics curves; and the physical meanings of parameters in the consistent functions have been deduced and discussed. Finally

a comprehensive function expression which can reflect the relation among consolidation pressure

suction and water content

is established. The study has made up for the deficiency of other methods which can not consider the consolidated pressure and is very significant for the supplement and development of the theory and experimental method of soil-water characteristics curves.