An assessment index system including 11 indexes for natural vulnerability, artificial vulnerability, and burdening vulnerability is established to appraise water resource vulnerability in Hengyang City of Hu'nan Province. The 5 grade and 100 score method is used to get the quantitative scores of evaluated index and the integrated index method is used to calculate the vulnerability scores. Critical value of each evaluated index is ascertained by consulting index extremum of 8 provinces in South China. The results of assessment demonstrate that ...