Impact of Coal Mining on Karst Water System in North China

Based on a large number of data, the paper analysed the influence factors of coal mining for the karst water system in north China, used analytic hierarchy process (AHP) for evaluation of the effect of coal mining on the karst water system, and divided influence degree subareas of State-planed 21 coal mining areas. We also come up with some suggestions on prevention and control measures of principle according to the different influence degrees.