Based on the developed marginal oilfields in Bohai Sea, the interface data of upstream disciplines are combed and summarized, the key data indicators are formed considering the factors such as reservoir type, drilling depth, supporting distance, etc., the rapid economic evaluation system and calculation model are established, and the economic benefits and reserve development boundaries of the oilfield under multi-factor changes are obtained. Taken a marginal oilfield in Bozhong as an example, the average difference rate of the key parameters is less than 10% compared with the conventional evaluation values. The reliability of the model is verified, which can meet the requirements of exploration target evaluation, reserve target evaluation and early research rapid evaluation, and provide quantitative economic support for rapid decision-making of the marginal oilfield development in Bohai Sea.