Abstract: There have been several shortages with the index and method, based on this, the comprehensive assessment index system in mine was established primarily, the meanings and harm character.Fuzzy comprehensive assessment technology is proven to be a valid method and been used comprehensively, this method was brought forward to assess the harm of mine dust with matched with assess index, ascertain the degree of harm, furthermore, make some useful advises, it was an efficient method for assessment of dust hazard, it could be used to prevent and control dust.