Abstract: The participation of demand response（DR） resources in the interaction of power grids enriches the means of power grid dispatching. However, due to the uncertainty of DR resources and the difficulty of direct control of individual interest, the transaction default probability of DR resources is higher than that of traditional power resources, which complicates the settlement and punishment mechanism. In order to effectively guide the demand-side resources to actively participate in response, a blockchain-based DR resource credit management method is proposed to reduce the risk of default, thereby improving the availability of DR for participating in scheduling. A DR resource transaction mechanism considering credit value in centralized transactions and bilateral transactions is established. And the smart contracts at each stage of the transaction are designed and deployed on the Ethereum test chain to explore the response effects of users under different credit values. The example shows that the proposed transaction method can effectively reduce the cost of DR resources, and the trustworthy users can obtain more benefits, thereby effectively guiding DR resources to participate in market transactions from a long-term perspective and maintaining the stable development of DR resource transaction markets.