Rough set theory provides a case-based reasoning decision analysis method which don't need any prior knowledge except the data set. Landslide disaster risk assessment relates to internal and external factors, which belongs to the multiple attribute decision analysis. This paper chose Yucheng District, Ya'an, Sichuan Province as the pilot region, gradient, aspect, elevation etc. seven landslide disaster related basic factors were analyzed. Use Boolean reasoning algorithm to preprocess, then acquire evaluation rules, finally, check the rules with the test dataset.
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