The article set up a water quality safety evaluation index system on the basis of internal factors, external factors and
water quality factors, through collecting and sorting of different kinds of information of Ji Nan urban water supply
system. Make use of the fuzzy comprehensive evaluation methods on the basis of fuzzy mathematics and GUI in
MATLAB technology for Ji Nan urban supply system’s all-round evaluation. And find the potential impact factors in
order to supply the management of Ji Nan urban water supply system with theoretical basis.