Abstract: Abundant coal resources and lack of water resources in northwest China，mine water comprehensive utilized has an important significant，which generated form coal mine mining.All Mine design reports of 36 coal mine in northwest were collected，after investigate and survey in Xinjiang Shenxin company and Ningxia Ning coal group，then an average water supply for unit coal mining was about 0.261m³ for coal mine in northwest，water inflow about 0.54m³ for unit coal mining，an average water inflow of unit coal mining was more than 2 times to water supply amount，so under the situation that water supply all used mine water in all coal mine in northwest China，and it could only reached about 42.2% to total mine water inflow，so in order to improve mine water use ratio in northwest China，some related preferential policies for mine water resources utilized should be introduced，external water supply should be harmonized，and mine water industrialization comprehensive utilization should be improved greatly.