In order to improve the description method of variation of structural parameters

according to the existed problems of the stress ratio structural parameters

this article proposed the equation description of initial structural parameters that may take the initial water content and the confining pressure of structural loess into account

and also established a more reasonable description of equation between the structural parameters and the generalized shear strain

which is introduced into the strength theory of structural loess. Then the distribution of structural parameter and the potential sliding surface of structural loess slope are evaluated through the numerical computation. The results show that: the newly established initial structural parameters can reflect the distribution of initial structural parameters in structural loess slope; the upper limit of structural parameters is the initial structural parameters

while the lower limit of structural parameters is the structural parameters that the structural strength is completely lost; and its value is equal to 1.0. In the stability analysis

the potential sliding surface can be determined through the distribution of structural parameters to some extent; but it just can be effective under the circumstance that the plastic zone in slope shows the obvious banded concentration distribution.