Abstract: Aimed at the problems of the conventional appraisal method for electronic contracts, such as difficulty in ensuring the appraisal information of the appraisal subject, non-openness and transparency of the appraisal procedure, and poor data privacy, an appraisal method for electronic contracts of electricity trading based on blockchain technology is proposed. On the basis of the constructed appraisal architecture based on the Hyperledger Fabric, the member service provider module was used to manage the identity authentication and access rights of each node, the appraisal procedure was supervised by uploading the data of key steps in the appraisal procedure, and a smart contract with an evaluation function was designed to encourage appraisers to maintain the stable operation of the appraisal blockchain. Security analysis and performance analysis show that this method can not only effectively ensure the privacy and security of the appraisal material data, but also resist a variety of malicious attacks and does not require the participation of a trusted third party.