Despite the extensive research on the low carbon economic dispatch of the integrated energy system, the influence of the user side on the optimization of the system dispatch has been neglected, which makes it difficult to effectively regulate the source side. Therefore, a low-carbon economic dispatch method before RIES taking into account the integrated demand response and green certificate-carbon trading mechanism is proposed. First, the low-carbon complementary characteristics of source and load are considered. Second, an integrated demand response mechanism is introduced on the load side, and price-based demand response and incentive-based demand response models are established for different types of loads. Finally, the reward and punishment step-type carbon trading mechanism and green certificate trading mechanism based on the distributional decision-making carbon allowance system are adopted, and the carbon emission rights and green certificates of the system surplus are traded in the market.