Abstract: To reveal the complex characteristics and essence of mine disaster system, the paper elaborated the definition, classification and characteristics of the mine disaster chain, studied the mine disaster development mechanism and proposed a disaster mitigation model by combined chain scission, that is the chain scission model combining the initial chain scission, preventive chain scission and post-disaster reconstruction. Employed in a colliery of Huaheng Company, the model can prevent and control goaf water in the western part of the colliery. The mine disaster chain effect is prevalent in mine disasters. The combined chain scission model for disaster mitigation will be the best scheme for disaster reduction. Moreover, the realization of chain scission optimization through calculating the level of chain scission and the contribution rate of sub-chain scission process to the total chain scission will be the focus of future research.