Qintong depression are divided by three structure belts, the faulted belt, the deep sag belt and the slope belt, controlling the banded distribution of oil fields. Beihanzhuang oil field is in the exterior slope belt. According to the analysis of biomarker parameters and concentration in extracts of source rock and oil, combined with the routine geological and geochemical methods, the process of migration and accumulation of Beihanzhuang oil field is studied systematically. The results indicate that two types oil could be identified. The first type is Es₁ and Ef₃ member oil, which is derived from Ef₂ member source rock of deep sag. The second type is Ef₁ member oil which is derived from Ef₁ member source rock of deep sag. Integrated with the analysis of pyrrolic nitrogen compounds and its parameters, Beihanzhuang Ef_3,/Ef₁ and Es₁ member oil migrated from deep sag to Beihanzhuang structure belt apparently. Also, in accordance with of the generation and discharging history of hydrocarbon, the faulted sealing capacity and the formation stage of accumulation, Ef₂ member source rock generated and expulsed hydrocarbon during the Dainan formation period and reached the generated hydrocarbon peak during the Eogene period, which is matched with the Ef₃ member the formation stage of accumulation. After Sanduo movement, the vertical sealing capacity of Beihanzhuang faults was competent so that the Ef₃, Ef₁, Es₁ member oil was generated from Ef₂ and Ef₁ source rock and migrated by Ef₃ and Ef₁ member sand body from deep sag to slope belt forming the lithologic structrual oil reservoirs dominantly.