By taking the porosity micro-structure of slide-zone soil as an research object and employing quantitative analysis method,relationships between the variable characteristics of micro-structure of loess slidezone soil and dynamic stress are studied under different experimental conditions.Results from the studyshow that the porosity micro-structure parameters of the loess soil present a certain regularity underincreased consolidation stress,and there are linear relationships between the porosity micro-structure parameters(i.e.,pore quantity,proportion,form ratio,average diameter and fractal dimension)and dynamicstress.