Groundwater vulnerability assessment is one of the important means of local groundwater resource management and pro - tection. Because of the particularity of the Niangziguan spring, this study selected the thickness of unsaturated zone, recharge inten - sity, lithology of the unsaturated zone and respone of spring to the basis the European approach. It used fuzzy evaluation method to assess the groundwater vulnerability and produced the vulnerability map. The results show that the easily contaminated area is mainly distributed in the exposed areas of the Niangziguan spring, the extremely difficult to contaminated areas is mainly distributed in the west area of Yuxian-Yangquan-Pingding-Xiyang-Heshun, and some places of Shouyang County. The results has a certain reference value to establish reasonable protection for the Niangziguan Spring.