Groundwater resources carrying capacity evaluation is extremely important in preserving harmonious and sustainable development of water resources, ecosystem, society and economy. In this study, fuzzy comprehensive evaluation of the groundwater resources carrying capacity in North China Plain(NCP) was conducted and grey relational theory was used in analyzing the influencing factors of groundwater resources carrying capacity. The results showed that the mean value of groundwater carrying capacity in cities of NCP was 0.38, among which cities that of much developed in groundwater but still with a little exploitation potential accounted for 19.0% of the total, while that close to potential and over-exploitation accounted for 38.1% and 42.9%, respectively. So groundwater resources had been over-exploited with extremely weak carrying capacity in NCP. The grey correlation degrees of groundwater exploitation with population, the first industry output, the third industry output, GDP and industry output were 0.71, 0.63, 0.59, 0.58, and 0.56, respectively. Generally, the most important influencing factors of the groundwater resources carrying capacity in NCP were the growth of population, the increased agriculture irrigation and the rapid economic and social development.