<p>With the rapid development of blockchain technology, blockchain technology has begun to be applied in power grid scenarios for reliable and trustworthy data management in information sharing and resource transactions. Considering the diversity of business, the dispersion of data, and the lack of credible safeguard mechanisms for centralized management in plant-grid coordination business systems, this paper proposes a chain model of blockchain and an on-chain data storage method that adapts to the data form characteristics of the scheduling business system. Firstly, the storage data blocks are linearly linked in chronological order, and the actual business data are stored on the chain. Secondly, the block storage data block summary information is verified to ensure the global consistency of the data. Finally, a flexible block data indexing method was designed to support high concurrency in business systems, enabling efficient data sharing and preventing tampering. It provides a reliable support system for secure and trustworthy service of the electric power business and has significant application value in the digital transformation of electric power industry.</p>