中文摘要：

通过分析目前广泛采用的DRASTIC方法存在的主要问题，将含水层脆弱性定义为模糊概念，结合模糊分析评价理论及三标度分两步的层次分析法建立了一套改进的含水层脆弱性评价模型。为测试其可靠性，分别将改进模型和传统DRASTIC模型应用于祁县东观镇含水层脆弱性评价中。研究结果表明：改进模型得到的脆弱性等级变化较后者更灵敏，分布范围及变化情况更精确，更能真实反映含水层脆弱性在空间上的连续变化，且计算简便、脆弱性分区图效果直观，丰富和完善了地下水脆弱性评价方法。

英文摘要：

According to the analysis of the main problems in DRASTIC model, which is used for assessing groundwater vulnerability, the groundwater vulnerability is regarded as a fuzzy and stochastic concept. A modified groundwater vulnerability assessment model was developed, which based on fuzzy theory and an improved AHP method. The modified model and DRASTIC model were both applied to assess the aquifer vulnerability in Dongguan Town. The results derived from the two methods are similar in the whole, but the grade changing of the modified model is more sensitive and the distribution is more precise, which shows the spacial continuous of aquifer vulnerability. So it is consistent with the practical situation and easy to use.