Abstract: Based on the previous research, the porosity distribution function in gob is developed. Multicomponent gases field flowing law in coal mine gob is given based on computational fluid dynamics theory. Taking Pansan 1472(3) working face as an example, three-dimensional distribution of gas and oxygen is shown, and the ranges of coal spontaneous combustion regenerative oxidation zone and gas accumulation zone are delineated. The simulated data and measured data from high drainage roadway and 1472(3) intake airflow roadway are anastomosed, which verifies the dependability of CFD simulation results.