Abstract: In view of the biased power data security in the smart power grid, a kind of decentralized data storage and sharing model is proposed. The edge nodes uploads local power data to a private blockchain and deploys the access policy complied as smart contracts to the upper-level consortium blockchain. According to the proof provided by the requestor, it is judged whether the data sharing constraints in smart contracts are met so as to realize effective sharing and access to the biased power data.