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The distribution of hydrocarbon gas reservoir in Changling fault depression was controlled by the distribution of hydrocarbon source rocks and development characteristics of faults�� The formation of early gas reservoirs ( original gas reservoir) mainly controlled by the distribution of hydrocarbon source rocks; the formation of later gas reservoir ( secondary gas reservoir) was mainly caused by communicated gas source ( the source rocks of Shahezi and Yingcheng Formations) and trapped faults as the migration pathway of hydrocarbon�� The main gas-bearing structures ( Haerjin��Dalaoyefu and Shuangtuozi structures) were already at fledgling stage in Yingcheng Formation�� and most of the structures stereotyped at the last stage of Nenjiang Formation�� The formation time of gas structures was earlier than the main hydrocarbon time�� The Fulongquan structure formed during Nenjiang stage��and stereotyped in Late Paleogene�� Hydrocarbon gas reservoir mainly formed during Qingshankou--Nenjiang stage�� The volcanic rocks of Yingcheng Formation and the detrital rocks reservoir of the Denglouku Formation and the members 1and 2 of Quantou Formation were the main exploration target for hydrocarbon gas in the future��