In order to ensure the comprehensive integration of new energy sources and enhance the safety and reliability of the power system,it is imperative to involve more flexible resources in scheduling operations. Developing market-based mechanisms for entities such as load aggregators and fully leveraging their regulatory capabilities are crucial for advancing the construction and development of the new power system. The current situation of demand response participation in flexible loads is analyzed from the 4 aspects of participating entities,access conditions,response rules,and compensation rules. Based on the frequency and peak demand requirements in load control scenarios,an optimization dispatch model for flexible loads is constructed. The subsidy price and response quantity of each load subject are determined by the bidding principle of“price first,capacity first”,which is commonly adopted by most provinces and cities in their mode of unilateral quotation. A system test of 5 000 flexible loads,including independent loads and load aggregators,is conducted to evaluate the optimization speed. The test results indicate that the model meets the requirements of rapidly and efficiently adjusting loads in the demand response market.