Since the new direction of cryptography emerged in academia in 1976，with the maturity of information encryption technology，and point-to-point transmission and distributed computing have gradually become popular. The global economic scale，financial development needs and the scope of assets are constantly expanding，blockchain technology based digital currency came into being and keep evolving. After 12 years development，it now has a place in the new financial field and has played an important role in the global financial game. Since October 2019，the Political Bureau of the Central Committee of the Communist Party of China conducted the eighteenth collective study on the status and trends of blockchain technology development. Governments of various countries have promoted the development of blockchain technology. Due to the convenience of digital currency in the exchange between cyberspace and physical space，it has become as an objective existence that coexists with blockchain technology. This report aims to explain the application of digital currency in the global new financial field through the taxonomy，and point out the risks that it faces.