It is very important for preventing the disaster by the landslide to estimate the landslide reaching distance. In this paper, it was tried to estimate the landslide reaching distance by analyzing past landslide cases. Before analyzing them, cases where the shape before and after the landslide movement was apparent were extracted from the literature and the report, etc., and they were objects of this study. As a result of patternizing the cases, mudstone and sandstone (including an alternation of sandstone and mudstone) amount to half the number of the population and Tertiary Period do to about 70 percent, therefore geological features of the landslide became clear. In multiple regression analysis, the extremely precise predicted expression was gained by assuming the prediction index to the slope gradient after the landslide movement : α, and doing the explanatory variable to between the slope gradient before it : θ and width of the landslide :
W. Especially, the multiple correlation coefficient became R=0.923 on the mudstone in Tertiary Period. Moreover, significance and validity were confirmed by analysis of variance and residual analysis.
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