In order to make the rural drinking water safety in Liangzhou County develop scientifically and reasonably , according to the regional features and actual situations of Liangzhou county in Wuwei City , based on the previous water quality evaluating models, the paper considered the rationality and shortcoming, the fuzzy synthetic evaluating model for Liangzhou County surface water quality was established by fuzzy mathematics method. It also analyzed the insecurity factors of rural water-drinking safety in Liangzhou county while testified the scientific and rationality of this model, and presented the suggestion and measures for solving the existent problems.