Abstract: Based on a statistical analysis of the chemical analysis data on 214 water samples from five coal mines in Xingtai,this paper presents the ways of forming subordinate degrees by means of the frequency statistical analysis and the normal distribution function, the math models which are used to work out values of standard parameter and weight and the fuzzy math method of detecting and evaluating water sources. Test results from the 214 water samples show that the method is both practicable reliable.