The places where Guiyang handles most credit cards are: the business outlets of major banks such as China Bank, China Construction Bank, Agricultural Bank and Bank of Communications, and the business outlets of major commercial banks. According to relevant public information, Guiyang is an important economic, cultural, commercial and tourism center in China, with rich financial service resources. Therefore, the business outlets of major banks are set up in Guiyang to provide convenient credit card processing services for citizens. In addition, major commercial banks also set up business outlets in Guiyang to provide credit card processing services to meet the needs of the public.