Abstract: In view of the problem that the hydrogeological condition of sandstone fractured aquifer in Wolonghu Coal Mine is complex, taking the sandstone aquifer of coal roof and floor from the 6th to the 8th layers(Qihan) as the research object, based on 3 quantitative indexes of lithologic structure index, fractal dimension of fault structure and fold plane deformation coefficient, the water abundance of the aquifer was evaluated by fuzzy cluster comprehensive evaluation. The results showed that Qihan of Wolonghu Coal Mine are mainly medium water abundance area, the weak water abundance area are mainly distributed in the north and the midwest of the mining area, strong and extra-strong water abundance area are concentrated in the south of the mining area. Based on the hydrogeological information such as the maximum consumption of washing liquid and the adoption rate of core, the reliability of the comprehensive evaluation result of fuzzy clustering is verified.