Abstract: In order to analyze the protective effect of extra thin protective seam mining, taking Ji₁₅ outburst coal seam of Pingdingshan No.12 Mine as the research object, taking the thickness of 0.3 m to 1.1 m of Ji₁₄ extra thin seam at the top 9 m to12 m of Ji₁₅ seam as a protective seam mining to achieve the goal of outburst elimination of Ji₁₅ protected areas. Through the field test of regional outburst elimination indexes about the protective effect of the protected seam, the gas drainage effect at the working face of the protected seam and the analysis of gas emission regularity in mining, these three aspects evaluate the protective effect of the protective seam mining. Protected seam gas drainage effect shows that after the mining of protective seam, the maximum daily gas drainage in protected area increased of 17.61 times, the month gas drainage increased 11.48 times, and the air exhaust gas increased 2.74 times; the regional outburst prevention effect shows that the residual gas content is from 1.91 m³/t to 7.37 m³/t; gas emission law shows that after the protective seam mining, the gas emission of protected seam is 6.5 m³/min. The results shows that the Ji₁₄ coal seam 31010 working face mining has played a role in the protection of eliminating regional outburst for the protected seam Ji₁₅-31010.