A blockchain-based demand response transaction mechanism is designed by integrating the identity authentication,bidding algorithm, settlement and supervision of demand response transaction with the blockchain architecture. The goals of transaction process control, time - scale -based pricing, settlement and supervision are achieved. A time-scale-based pricing strategy is proposed to achieve the balance of interests of all parties in the trans-action. This method optimizes the demand response transaction process and improves transaction efficiency. The system has the characteristics of openness and transparency. Where the transaction data cannot be tampered, and transactions records can betraced in the proposed system.