An integrated energy system capacity allocation and optimized operation method considering integrated demand response is proposed. Firstly，an integrated energy system is constructed，the operating principle of each unit equipment is introduced，and the principles of controllable loads participating in the demand response of the integrated energy system are analyzed.Then，a two-level collaborative planning model for equipment capacity configuration and operation strategy is established. The upper level capacity allocation model is established with the lowest total planning cost as the objective function，and the lower level optimal operation model is established with the lowest operation cost as the objective function. Differential evolution algorithm and CPLEX linear solver are used to solve the bilevel programming model. Finally，taking the typical intraday integrated energy system load demand，energy price and other data as an example，the practicability and effectiveness of the proposed model are verified through the analysis.