Abstract: Yaoyingtai Oilfield is a big scale hydrocarbon region in the south of Songliao Basin discovered in recent years. According to analysis of hydrocarbon accumulation conditions in Qingshankou formation in Yaoyingtai region, major control factors of the formation of oil reservoirs includes source rocks, reservoir and migration. The oil reservoirs are mainly located around Qian'an sag which is the hydrocarbon generating center, and the accumulation and distribution of oil reservoirs is controlled by source rocks. Faults are not only the pathways for hydrocarbon migration, but also control the distribution of different types of oil reservoirs, and the distribution of sand body and reservoir physical properties are controlled by sediment microfacies. The main target for exploration of next step is the region near the hydrocarbon generating centers, faulted zone and sand body development zone.