Abstract：Using fractal theory,based on data from the No. 7 mine of Pingdingshan,the fractal dimension of faults structures( Ds) in II-1 coal bed was computed,and the structures complexity of faults structures was analyzed and divided. Then the contour map of Dswas drawn by using Surfer software. The result showed that the mine water irruption rate was found to increase with the fractal dimension. The values of Dsare between0. 729 5 and 1. 729 7,and the overall complexity of the fault structures is more complex in the study area. This study has a positive reference for controlling coal mine flood.

Keyword：fault complexity;fractal dimension;water inrush;fault structure;