Combined with three LNG light hydrocarbon recovery processes reported in the literature, a new process using the cold energy released during the vaporization of liquefied natural gas（LNG） was proposed. Using HYSYS simulation software and P-R state equation for thermodynamic method, sensitivity analysis of the new process was carried out. The optimal inlet temperature of flash column, the top pressure of demethanizer and the top pressure of deethanizer are determined to be -105 ℃, 2800 kPa and 2000 kPa, respectively. Through comparison, it is found that the new process has certain advantages in methane production, ethane recovery and equipment exergy analysis.