At present, the import of LNG accounts for over 50% of China's total natural gas imports. The composition of LNG varies according to the different producing areas. Over 76.6% of the imported LNG has a light hydrocarbon content exceeding 5% mole. At the same time, LNG contains a significant amount of cold energy, which can be highly efficient, achieving 90% efficiency in recovering light hydrocarbons from LNG. In this paper, an integrated process system of recovering light hydrocarbon and BOG by LNG cold energy is proposed based on the analysis of the pros and cons of the existing process system. A case study on a domestic LNG receiving station was carried out by analyzing key operating parameters of simulation modeling of LNG rich liquid process. The results show that the light hydrocarbon recovery rate is as high as 95.7% and the energy consumption per unit of product is only 688 MJ/t. Moreover, the energy required for BOG recovery is minimal, and the process performance indicators have reached leading levels at home and abroad. The research results provide reference for the development of light hydrocarbon recovery unit in LNG receiving stations.