Abstract: The integrated energy system has important application value for realizing sustainable energy development and building a green and low-carbon society. Aiming at the problems of large load forecast errors, complex system optimization data collection and processing, and high cost of operation in the integrated energy system scheduling process, we introduced blockchain technology into the integrated energy system optimization scheduling process with electric-thermal-gas load integrated demand response be considered. Driven by smart contract, with the optimization of system economy and environmental protection as the goal, a low-carbon optimal dispatch model suitable for the integrated energy system was proposed. Using the characteristics of blockchain technology, we built an overall architecture for the optimal dispatch of the integrated energy system, making the blockchain network become the information interaction and data storage center of the entire integrated energy system. At the same time, part of the guiding role of the dispatching center was retained to ensure the power grid safe and stable operation. The simulation results show that the blockchain technology can further tap the value of the integrated energy system data and better realize the transparency of information exchange; at the same time, the low-carbon optimization scheduling model of the integrated energy system can effectively improve the flexibility, economy of operation and environmental performance of the system’s energy supply.