This paper discusses the insufficient refrigeration capacity of ternary refrigeration compressor in summer caused by light cracking raw materials and the high energy consumption during LPG vaporization, and uses Aspen HYSYS to calculate the amount of heat released by LPG vaporization and the energy consumption during the cooling of ternary refrigeration system. The results show that the amount of heat released by LPG vaporization can meet the demand of ternary refrigeration system. Through technological transformation, the production bottlenecks in summer can be solved, and the energy consumption and ethylene loss can be reduced, achieving significant economic benefit.