Abstract：The coal-fire is one of the major disasters during coal mining, and also is one of worldwide hazards. The fracture of coal rocks provides an air supply channel continually for the combustion of coalfire. In the paper, the combustion mechanism in a coalfire area is discussed, and the gas transporting characteristics are analyzed, and the fracture development laws of coal rocks are studied. Then the deficiency and outlook on the current research of coalfire combustion are pointed out. The study would provide a scientific basis and a theoretical guidance for controlling coal fire.

Keyword：coalfire area;fracture development of coal rocks;coupling laws;gas percolation;combustion mechanism;