Abstract: In view of the challenges of load aggregator brought by the uncertainty of multiple loads on the demand side in operation process of load aggregator,this paper establishes an load aggregator operation optimization model considering demand response uncertainty is established in this paper. Firstly,aiming at the uncertainty analysis and classification of demand side load,a load aggregation model is established. Then,considering the uncertainty of demand response,an operation optimization model based on conditional value at risk is established for maximizing the revenue of load aggregators. Finally,the wind-optical,load and real-time electricity price data of a distribution network in eastern Inner Mongolia are selected to verify the operation optimization model proposed in this paper. At the results,it can make full use of the regulation ability brought by the demand side response for the power grid,and effectively improve the operation income of load aggregator effectively.