Abstract: In order to study the effect of gas drainage on easy spontaneous combustion of residual coal in goaf under the condition of coexistence of complex disasters in the goaf of coal seam with high gas and easy spontaneous combustion, taking the first mining of 4101 working face in Wenjiapo coalmine of Binchang mining district as the research object, using 3D visualization of ANSYS numerical simulation technique, the study established the numerical model of air leakage flow in working face goaf, and quantitatively compared the difference of gas concentration distribution of goaf, air leakage flow field and spontaneous combustion zone width variation under three different drainage methods including high drilling extraction, adjacent lane extraction and buried pipe extraction. The results of the study show that the technique of high drilling extraction is the best under the same extraction volume, which has relatively small influence on leakage field and the change of spontaneous combustion zone width in the bottom of goaf within 30 m. It can reduce the composite disasters of gas and fire and provide effective guarantee for the working face mining with safety and efficiency.