Abstract: In order to ensure the reliable operation of water supply network in mine, decrease the rate of pneumoconiosis, ensure the safety of production and life, by analyzing the mine water supply network and studying the influence elements of mechanical reliability in mine water-supply-networks, in combination with relevant laws, regulations and statistical data of accidents, we established a three-layered evaluation index system for the network, which includes 5 first-order indexes, 14 second-order indexes. Based on the analytic hierarchy process (AHP), the weighting factors of these indexes were calculated. The consistency check result indicates that the obtained weighting factors are effective. Such a system provides an efficient evaluation method for reliable operation of mine water-supply-network.