Abstract: Carbonate rocks are widely distributed in the karst mountain area of southwest China. Because of the intensively developed karst ecological degeneration, the water resource distribution in this region is seriously imbalanced. On the basis of hydrogeology, social economy and regional environment data, 28 indicators were selected from four aspects groundwater resource condition, development and utilization of groundwater resource, social economy, and ecological environment to establish an assessment system for groundwater resource sustainability in karst mountain area. Meanwhile, the weights of the indicators based on fuzzy analytical hierarchy process(FAHP) were determined, which reduced the fuzziness of man-made judgments. The sustainability of groundwater resource was evaluated taking Weining area of Guizhou province as an illustration.

Key words: southwest karst mountain area, assessment of groundwater sustainability, fuzzy AHP