On August 19th, the International Finance News published an article by Zhang Rui, a professor of economics at the China Market Association. "Libra will promote the development of national legal digital currency." The article said that Libra will drive the market to re-recognize digital currency, calibrate and survey virtual currency. Commercial positioning. Libra also drives the widespread use of blockchain technology. Once again, Libra will promote the development of national legal digital currency. The development of private digital currencies and the development of legal digital currencies are not antagonistic and exclusive. Finally, Libra can seek a breakthrough in “super-sovereign currency” through micro-experiment, and promote and expand the scope of subsequent applications.