Abstract: This paper investigates the charging process for ice storage in a flat and rectangular capsule by ice storage experimental device,and concludes the corelation that the temperature of cool storage agent and the temperature of coolant vary with time.It also investigates the supercoolimg phenomenon and nucleation agent of water inside the flat rectangular capsule during the charging process of ice storage system.This way can improve the coefficient of the performance of the chiller unit in the ice storage air conditioning system.