Abstract: The type of Jiangsu and Anhui basin is a polycycle basin. There are four hydrocarbon source layers like Xiaqinglong formation(T₁x), Permian system, Gaojiabian(S₁g)-Wufeng formation(O₃w), Mufushan formation(∈₁mu). The organic matter is abundant for forming gas pools. We learned from the study of organic matter maturity that the maturity of many hydrocarbon source rocks had been mature, highmature, even postmature. Many hydrocarbon source rocks has been the phase of mainly generating gas. We learn from the study the drilled wells that there are hydrocarbon and non-hydrcarbon gas in the area. According to the research of HQ dioxide gasfield, we found the tectonic fracture-pore and fracture-solution cavity are the mail reservoirs; faults take great roles for the oil-gas pool-forming. The discovery of HQ dioxide gasfield indicates that the geological conditions is better for the pool-forming of Mesozoic-Paleozoic, so we have the bright future for gas exploration.