Abstract：In order to study the dynamic evolution of the water resources vulnerability ( WRV) in Hunan province. By using GIS, RS technology and based on the water resources pressure-sensitivity-applicability ( PSR) conceptual model, an evaluation index system for WRV was constructed. Meanwhile, principal component analysis ( PCA) and entropy method was adopted to determine the weight of WRV index from 2005 to 2013.Then the spatiotemporal characteristics of WRV and its reasons was analyzed as well. The results show: ( 1) during the study period, the spatiotemporal distribution pattern of WRV is low in the border regions and high in central regions, strong in the east and weak in the west; ( 2) Severe vulnerability of WRV centralizes along the north and east, while the slight and moderate vulnerability is ladder-like distributed along the south and west. Meanwhile, the areas of moderate vulnerability disperse all over the study area; ( 3) the feature of time series of the WRV typically present fluctuated at the begin and end of the study period, and relatively stabilized in the middle period; ( 4) from the spatial differentiations of evolution, the vulnerability changes are broadly divided into two types: continuous growth and low speed stability. In recent nine years, WRV of Hunan province had an strong spatial and temporal variability. The impact of human activities is the dominant factor that drives water resources continue to be fragile. Meanwhile, the frequently heavy rainfall events is the direct causation of the coexistence of increased and weakened WRV.

Keyword：water resources vulnerability;spatial-temporal evolution;PSR model;Hunan province;