The filled high slope is a peculiar type of soil slope

and the dispersion of its mechanical parame- ters is closely related to the construction process.Thereby in order to have a better control over design and construction for this type of filled slope

it is very important to find out the ordinal significance of all pa- rameters on the stability of the slope and what will happen under the condition of earthquake or overload- ing.Taking the filled high slope of Dafan（in Hubei province）as an example and on the basis of changing law of the stability factor due to the earthquake and overloading distance away from the slope top

this pa- per presents some analytic results in those aspects with the method of orthogonal design

which will be valuable for future research.