Blockchain technology is one of the core technologies that China vigorously develops. In recent years, blockchain technology, with its technical advantages, has caused exploratory research and technological innovation in various fields. Based on 286 core journals on blockchain technology in CNKI database in 2016-2020, it objectively analyzes the distribution, application field hotspots and development trend of blockchain technology research, and uses bibliometric method and Pejek software for visual analysis. The results show that the technology integrates distributed ledger, asymmetric encryption, consensus mechanism and smart contract, and it has the advantages of high security, strong independence, decentralization and tamperability; it highlights the application value in the fields of finance, copyright protection and information security, and is gradually applied and empowered in many fields.