Abstract: With the increase of mining depth, the number of old roadways and goaf rises up, and these may be the reason of the rising gas burning accidents of high gas seam with low spontaneous combustion tendency. An accurate analysis of the ignition source is the key to the prevention and treatment of such incidents. By the theories of underground pressure, coal spontaneous combustion, gas flows in goaf and gas burning, the gas burning incidents in 6₁35 working face of Qidong Mine are analyzed, it find that spontaneous combustion is the source of the gas burning accident. Then a program of closing fire zone is formulated and implemented before the fire zone is treated in a short time.