Abstract: Through investigating hydrological geology condition and water control situation, the study deeply analyzes influence factors of water disaster.Combining a certain coal mine in Guizhou Shuicheng area, 25 evaluation indexes are picked out rationally, hierarchical model is built up objectively and systematically; weight values of factors are calculated with analytic hierarchy process, and which are sorted by descending order. Based on weight of each single factor, risk assessment on coal mine water hazard is put up with fuzzy comprehensive evaluation, and risk degree is fixed as comparative safe.