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Central air conditioning is more and more applied in our lives. The energy consumption of central air conditioning accounts for more than 50% as which of large buildings. The global energy crisis sets off the alarm bells, thus energy conservation of central air conditioning system should be implemented without delay. The system of central air conditioning is complex.In order to provide an accurate model to study the control effect of the iterative learning control algorithm on the terminals of central air conditioner, it builds the model with the Trnsys platform. In order to overcome the weakness of the Trnsys control modules and realize various control algorithms,the joint simulation of Trnsys and Matlab is adopted.The iterative learning control can be applied to central air conditioning system that works periodically.The iterative learning control algorithm is simple,adaptable,easy to implement and takes good effect on repetitive working systems as well.The characteristics of iterative learning control such as rules,stability and convergence are studied and its performance is shown through simulation.It’s shown that the controlled variable can track without steady-state error after learning for several times.