Abstract: In order to analyze air leakage strength and oxygen concentration distribution characteristics of stoping goaf,finite element model of caving goaf air leakage flow pattern and oxygen concentration variation is established with heterogeneous air leakage seepage equation and oxygen concentration dissipation equation and resolved against observed data,and the flow field near working face is treated as two-flow layer flow between caving medium and caving slack.The result indicates that the oxygen concentration distribution between the inlet and return sides in the goaf is unbalanced,which is because of the road oxygen consumption and methane effusion of goaf air leakage flow.It is indicated that air leakage strength distribution between the inlet and return sides is basically balanced,and when the methane effusion is considered,the air leakage strength of the return side is even higher than the inlet side.The disproportion of the oxygen concentration between the inlet and return sides inside the goaf observed in the field is rationally explained from fluid mechanics principle.This conclusion conduces to clarify the fuzzy cognition against this issue in the current academic circle.