In order to speed up the mining needs of No. 9 coal in the operation of Sanjusheng Mine,  the construction of infrastructure in a mining area was carried out. The mathematical statistical method and the calculation method of fractal fractal dimension were used to study the structural characteristics of the mine from a quantitative perspective. It showed that the mine developed four fold structures and five large and medium-sized fault structures. The mine structure was controlled by the regional Ningwu coalfield structure. The faults with a drop of less than 2 m accounted for 61% of the total number of mine faults. The small fault control formed the main structural features of the mine. The fractal dimension of the regional structure was between 0.55 and 1.12. The dimension value of the second mining was relatively low, the structure was simple, the dimension value of the mining was higher, the structure was relatively complicated, and the fractal dimension of the mine body was less than 1.0. The overall evaluation of the mine structure was a simple type. .