Abstract: Aiming at the fuzziness existing in the zoned limit of slope stability,the multi stage fuzzy classification polymerization method is established by fuzzy mathematics.The calcuating method and procedure of two stage fuzzy classification polymerization in assessing the slope stability zoning is introduced.By using the two stage fuzzy classification polymerization,the slope stability type in accordance with the stability of the slope district of an area is selected. The comparison of this method with the calculating result of other assessment methods shows,the application effect of the fuzzy classification polymerization method is better than any others,it is a simple,rapid and good method.