The Beihuaiyang tectonic belt is composed of a series of thrust slices up to north, and is the link establishing the relationship between the Dabieshan orogenic belt and the Hefei Basin, Combustible gas and burned tunnels founded in Dabie orogenic belt have distinct regional nature, and most of them distributed in complex zone of north Dabie orogenic belt which located in the south of Mozitan-Xiaotian fault and the gneiss from the Lower Carboniferous which is close to Xinyang-Shucheng fault. These two faults provide source passage which is connected to deeper reserivor. The Cambrian Fengtai Formation under thrust nappes and the Carboniferous system of North Huaiyang Formation ,which are both marine deposites , are the main gas source rocks of tunnel combustible gas. And Lower Cambrian Fengtai Formation has been in an over mature stage of thermal evolution with the characteristics of high C、high“Ro”、high Tmax and low chloroform “A”；The Carboniferous hydrocarbon source rocks of North Huaiyang type have a high abundance of organic matter while kerogen is dominated by TypeⅢ,there has been abundant hydrocarbon generated, thereby the most important thing is to study the correlation between its process of hydrocarbon generation and the relating trap history. Combustible gas was found in the tunnel of the Dabie orogenic belt, it demonstrated that the deep marine sequence stratigraphy in Hefei basin had a good exploration prospects, so the next step should be the focus of exploration from \"Meso-Cenozoic basin system\" to \"deep marine sequence stratigraphy\", to find the main type of oil and gas reservoirs \" Paleozoic source Paleozoic reservoir \"or\" Paleozoic source Cenozoic reservoir \".