Central air-conditioning load of public buildings has become one of the most important peak load shifting resources by electric power company, for the features of using time concentration, large capacity, various adjustable methods and little influence on customer ,and so on.The compose of central air-conditioning power comsumption is analyzed firstly, and the adjustable stragies and effect of public buildings’ central air-donditioning for peak load shifting are proposed based on the demonstration project.Then, the structrure and optimal dispatch model of central air-conditioning for day-ahead peak load shifting are constructed with electric power compay’s minimum compensation fees ,considering the constraint of adjustable stragies, dispatch total and signal capacity, and so on.Lastly, as Jiangsu Province demonstration project on non-productive air-conditioning for example, the dispatch schedule in different period is got with CPLEX optimal soft ware.