The contribution rate of stratum to landslide growth of Yunyang-Wushan segment in Three Gorges reservoir region is analyzed by statistical information method of GIS and statistical overlaying method. The result indicates that three kinds of strata make contribution to the landslide among 20 kinds of strata. The presented method can be used to quantitatively analyze different effect of different strata on landslide growth，and new analysis method is offered for formation research of regional landslide. By using the new method，the shortage of traditional methods is overcomed，and the analysis result will be more reliable.