Abstract: The ternary refrigeration technology was developed by ABB Lummus Ltd., based on binary refrigeration technology. It was first used in the ethylene plant of Qilu Petrochemical Company Ltd. in China. It ia analyzed that most of process parameters could not reach the design values after first commissioning After taking correction action, the system became normal, and main process parameters reached design values. The situation of commissioning, problems during operation and the measures adopted are introduced. Recommendation for handling operation problems is also made .