Abstract: This paper introduce the development of ice storage system and overview the Concept of the district cooling technology.By studying the cooling plant of Beijing ZhongGuanChun square,the paper describes the performance of the main equipments including the chillers and coil,and the control strategy.The pictures in the paper show the principle of external ice storage system as well as the characteristics of charge and discharge of the coil.According to the data from the operaton and construction,the paper points out some advantages of external ice storage system in future.