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Energy consumption of Rail transit in our country is increasing year by year,thus the state vigorously promotes energy conservation and puts forward the concept of green rail transit. Since traditional air conditioning system of rail transit cannot adjust the water flow of cooling and refrigeration automatically under the dynamic work environment,and chillers cooling capacity surplus and other issues have not yet been solved,a new energy-saving control system has been researched in this paper. By analyzing the change law of cooling load of the station,this paper proposes centralized monitoring system,frequency conversion technology and the closed-loop control system so as to calculate the cooling load,achieve the control of motor speed intelligently as well as automatically adjust the volume of the refrigerating capacity of the chiller and air-conditioning terminal. Thus the cooling system can always working in the energy saving point. Since the energy-saving system is practiced in rail transit air-conditioning water system,power consumption has been considerably reduced and enormous energy conserved.