Abstract: Aiming at the serious problem about the flood disaster of sandstone at the coal seam roof and floor in Wolonghu Coal Mine, this article explains lithologic structure features and geological constructed features two aspects amounted to 3 indicators. Through fuzzy clustering comprehensive prediction method, a prediction for water abundance of sandstone aquifer at the bottom of upper Shihezi formation in permian (K₃) is made to grade partition. Based on various hydrogeological information revealed by exploration and extraction, using evaluation indicators of drilled mud leakage volume and fractured development rate, a evaluation on water abundance of sandstone aquifer is made, which verifies the reliability of predictions.