Abstract: Depending on the summary of the geological characteristics of CO₂ gas produced from Huanghua Depression, the paper states that the CO₂ gas is a type of multiple sources.It can be either intergrowthed and accompanied with hydrocarbon gas and liquid hydrocarbon or hetero-growthed and accom-panied with oil/gas water in the pattern of water-soluble CO₂ gas of multiple sources,meanwhile,it can be accumulated to be highly concentration CO₂ gas and distributed on the high locations of petroliferous structures.The variations of CO₂ gas content and the geological characters of CO₂ gas producing can be used as a director for reconnaissance and exploration of the hydrocarbon gas and liquid hydrocarbon.