Abstract: Condensate oil is more volatile and light oil has a high recovery rate. Taking CNOOC Huludao Fine Chemical Industry LLC as an example, this paper introduces the oil vapor recovery technology process flow with combined method of adhesion and adsorption, and carries out monitoring and analysis of environmental benefits, economic benefits and social benefits of the company after technical transformation. The results show that after technical transformation of oil vapor recovery technology, the detected concentration of oil vapor emissions complies with the requirements specified in GB20950-2007, the oil vapor recovery rate is greater than 95%, exhaust emission concentration is less than 5 g/m3, and recovered light oil is up to 100.24 t, with an annual income at 601, 400 CNY and net income at 5.15 million CNY.The application of the technology provides a support to safe operation for oil loading station and improves cleaning running level for the enterprise.