Fault types and activities were analyzed to reveal the control of fault characteristics on differences of oil and gas enrichment in the Neogene in the eastern Chengdao area，Jiyang Depression. On this basis，3D seismic data，as well as logging and drilling data，were utilized to study the fault activities during hydrocarbon accumulation and their relationships with the Neogene oil and gas enrichment in terms of the fault activity rate. Studies have shown that three types of faults are in the eastern Chengdao area，i.e.oil source typeⅠ，oil source typeⅡ，and adjustment faults. There are obvious differences in the activities of the three types of faults during the main accumulation period（Minghuazhen period）：the activity rates of most oil source typeⅠfaults，oil source typeⅡfaults and most adjustment faults are more than 15 m/Ma，10-15 m/Ma and less than 10 m/Ma respectively. The oil source faults in the study area control the differences in enrichment and spatial distribution of oil and gas in the Neogene. Zhuanghai fault zone has developed many oil source typeⅠand typeⅡ faults at an activity rate greater than 10 m/Ma，and the fault-caprock assemblage is favorable. A typical fault transport-vertical migration mode can be found，and the degree of oil and gas enrichment is high in the Neogene. In addition，oil source faults are few in the east slope of Chengdao area，with weak fault activities（10-12 m/Ma），following a fault-sand body transportstepped migration mode. The degree of Neogene oil and gas enrichment is low，and they are mostly distributed in the underlying reservoirs.