There is no doubt that the existence of the digital currency has placed significant impact upon the financial system，especially in the area of payment. Nowadays，there are a large variety of digital currency in the market，both the private digital currency represented by the “Bitcoin” and the central bank digital currency（CBDC）issued by sovereign state represented by Venezuelan “Petro”. Among those，the private ones cannot become the currency in reality due to a series of reasons including their incapability of completing the three major functions of currency. The CBDCs，however，attract many central banks to conduct research on them both conceptual and practical through their incomparable advantage. Because of their crying needs for reducing the transaction costs，improving the effectiveness of payment and the financial inclusion，the emerging market economies are far more interested in this type of research than the advanced economy，which tend to be confident with the existing payment system. This article summarizes some of the cases where central banks carrying out research upon the issue of CBDC and then produces a simple analysis upon the necessity and possible routes for China to issue the CBDC based on our national situation.