Based on the summarization of coal resource exploration data in the Chongqing area, analyzed Permian coal rank distribution features, and discussed impacts on coal seam gas content from coal metamorphism. The analysis has considered that the Permian coal in Chongqing area is mainly high to medium metamorphosed anthracite, meager coal and lean coal; coal rank distribution has obviously zonation; coal metamorphism type is mainly regional deep-seated metamorphism. The Ro of metamorphosed coal is 1.39%~2,51% in stronger adsorptivity stage, thus coal seam gas content is rather high, in them, Ro of anthracite in the Songzao mining area is 2.43%~2.51%, coal seam gas content can be 27.1m3/t as high.%通过对重庆地区煤炭资源勘查资料总结,分析了二叠系煤类分布特征,并探讨了煤变质对煤层含气量的影响.分析认为,重庆地区二叠系煤层主要以高、中变质煤的无烟煤、贫煤和瘦煤为主,煤类分布具有明显的分带性,煤变质作用以区域深成变质类型为主；煤的变质程度R0为1.39％～2.51％,处于吸附能力较强的阶段,因此煤层含气量较高,其中松藻矿区无烟煤R0为2.43％～2.51％,煤层含气量达27.1 m3/t.
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