Abstract: In order to improve the efficiency of gas drainage, a numerical model of gas drainage by buried pipe in goaf was established, taking the 5877y face of Linnan Cang as the research object. On the premise of keeping other parameters unchanged, COMSOL software is used to simulate the influence of different negative pressure on temperature field, oxygen concentration field and flow field in goaf. The results show that with the increase of suction negative pressure, the high temperature area of the goaf gradually diffuses to the side of the return air lane. The wind leakage flow is transferred from the area near the return wind lane to the end of the buried pipe and the leakage velocity increases. The width of the self-ignition belt on the air inlet side gradually increases, and the air return side decreases firstly and then decreases. The accuracy of the simulation is verified by comparing the simulation results with the field data.