Abstract: In order to obtain No. 3 coal seam reservoir features and gas distribution law in Lu'an Mining Area, the seam reservoir features were systematically anal yzed from the seam depth, coal metamorphism degree, seam permeability, coal adsorption features, coal structure and other aspects. Based on the circumstances, the quantitative relationship of the coal gas content and seam depth, coal metamorphism degree, seam moisture and ash content were studied, a seam gas content model was established and the distribution law of the seam gas content was obtained. The results showed that No. 3 seam in Lu'an Mining Area with high in thickness, stable i n deposition, deep the depth, high in metamorphism degree, large in Langmuir volume and low in Langmuir pressure would be favorable to the gas enrichment depositi on in the seam. In the mining area, there were many developed broken coal and broken partical coal, and partially mylonite coal. The coal structure was broken, the sea m permeability was poor, the permeability was lower than the domestic average level and a gas drainage and utilization of the seam would be high difficult. Under the s ame seam depth condition of each block, the gas content in the north part of Changzhi Block would be highest, the gas content in the south part of Xiangyuan Block WO uld be second and the gas content in the middle part of Lu'an Block would be the lowest.