Abstract: This paper presents a semi-graphic and semi-analytical method for determing the stability coefficient of the slope sliding mass ,instead of slices and accuracy methods under the simplest condition .The accuracy of determined stability coefficient by the introduced method may fully meet with the demand and the calculation amount is less . The method is essentially once-solution for the total a mount of silding body weight (or area ),and total amount being divided into tangential and radial components ,then the stability coefficient calculated .For comparison ,the geometrical parameters and strength indexes (c, φ)of the same slope are applied for calculations by the method slices (in 5 blocks and blocks ).accuracy method and the semi-graphic and semi-analytical method .The result shows kaccuracy > kgraphic > k10 > k5 ,which indicates the applicability and its accuracy . This method is suitable for stability coefficient calculation of the soil slope and rock slope of much fissured and cataclastic media in the simplest conditions conforming to the assumption .