Unlike the small-capacity temperature control load

the central air-conditioning has good potential of peak adjustment and precision response. In this paper

a central air-conditioning control strategy based on adjustable elastic margin of elastic temperature is proposed. Aiming at differences between end-users of central air-conditioning in load rate

subjective and objective circumstances of users are combined

considering the user's willingness to control the central air conditioning groups. Based on the control strategy

a new type of double-layer optimal control model is constructed to meet the requirement of air-conditioning load target from the perspective of load aggregator

and the profit of aggregator is maximized by considering the user's willingness. The case study part shows that the research strategy proposed in this paper is reasonable and effective

which provides relevant theory and implementation method for air-conditioning load to participate in grid auxiliary service.