In order to accurately reflect the condition of groundwater quality, this paper took the data from the typical monitoring point of Liaocheng as the basis,applied the methods of comprehensive evaluation and fuzzy comprehensive evaluation to evaluated the water quality of monitoring point,and probed into the evaluation effect of two methods.The conclusion indicated that the shallow groundwater quality and deep groundwater quality of Liaocheng are mainly Class Ⅲ and class Ⅳ, the main indicators over standard are total hardness and total dissolved solids;between the indicators over standard has a certain correlation;the evaluation value of comprehensive evaluation is too large and lack of class Ⅲ water;the method of fuzzy comprehensive evaluation is more suitable for groundwater quality assessment in Liaocheng.