Abstract:In the design of high soil slope,the influences of soil parameters are usually more significant than different calculated methods for the result of slope stability calculation. This paper will test and calculate the results of the safety monitoring,which is introduced by the Yuegan highway¢s high slope. As comparing and analyzing the abundant results of test and calculation,it was shown the significance of the rate of soil water in the analysis of the slope stability,and then, the water content is regarded as the one of the important parameters in slope stability analysis. Finally this paper presents the recommendation that the unsaturated soil has theoretically important applied value and it can be widely used in the design,construction and safety monitoring of high slope.