Abstract: In order to determine the explosion limit of oil-type gas, the oil-type gas samples of Huangling No.2 Coal Mine are analyzed in detail by using the explosion limit theory. The results show that the C₂H₆ and C₃H₈ contained in the oil type gas are the main parameters affecting the CH₄ explosion limit. As the addition of C₂H₆ and C₃H₈ increased from 0% to 2%, the CH₄ explosion risk increased significantly; C₂H₆ caused the explosion risk increased from the initial 2.0 to 9.12, an increase of 3.56 times; C₃H₈ caused the explosion risk increased from the initial 1.98 to 7.17, an increase of 2.62 times.