Abstract: Through the statistical analysis of geological data in Panxi Mine Field, the development laws of small faults have characteristics such as regionalization, directivity, and zonation and so on. By using the rose diagrams and the method of fractal structure, mechanical causes and complexity of small faults in mine field have been analyzed. Research shows that the fault structure develops three main groups of NW, NE and approximately SW trending fractures in this area, NE-striking faults cutting NW-striking faults, nearly NS-striking faults cutting NW and NE-striking faults. The overall pattern of structure is more complicated. The fractal dimension values of minefield structural complexity are mostly between 0.8 and 1.7, and the fractal dimension value of the whole region reaches 1.34. Among them, the low-value areas are mainly distributed near Liangpo fault in the northern coal mine field.