With the introduction of the integrated energy service strategy, the user-side integrated demand response (IDR) business has attracted more and more attention. This paper studies the corresponding business structure of the user-side integrated demand based on the multi-energy interconnection of electricity, heat and gas from four aspects. First, it analyzes the role positioning and characteristics of each business entity in the IDR from three aspects including function orientation, functional attributes, and business relationship. Next, it analyzes three business models of the IDR, i.e. engineering, investment, and operation. Then, the IDR business process is introduced from five links: IDR resource organization, IDR project management, IDR plan management, IDR plan implementation, and IDR incentive issuance. Finally, a user-side integrated demand response business structure based on the interconnection of multi-energy like electricity, heating and gas is constructed from the aspects of the physical layer, information layer and control layer.