The City Union Interconnection card can be used throughout the country because it is an urban smart card system built on the four unified principles of \"unified standards, unified interfaces, unified security, and unified certification process\". The national urban card interconnection platform that supports the operation of the system is planned by the IC Card Application Service Center of the Ministry of Housing and Urban-Rural Development, and is authorized to be constructed and operated by Yishucode Company. As of January 2018, the cumulative issuance of urban smart cards reached 900 million, an increase of 5% year-on-year, covering more than 800 million people. Urban smart card is currently widely used in bus travel, access control, scenic spots tourism, public utility payment, identity authentication, ferry, residential areas, cinemas, small supermarkets, parking fees, public bicycles and other dozens of scenes, covering all aspects of life, the daily transaction volume of nearly 680 million people