The trip card is a green code to prove that it has not been to a medium-risk place.

The trip code is a national one-code pass, in the normalization of epidemic prevention and control, the National Health Commission through the mutual recognition of basic data **** enjoy, in conjunction with other departments to develop a health code management and service system, clean up and standardize the existing various types of epidemic prevention and control code, in principle, a province only to retain a coordinated construction of health code, the country is now basically realize the health code of the "one code passes".

Trip card:

Communication big data trip card, by the China Academy of Information and Communication Technology, China Telecom, China Mobile, China Unicom three basic telecommunications enterprises using cell phone "signaling data", through the user's cell phone is located in the location of the base station to obtain, for the country's 1.6 billion mobile phone users to provide free query. 1.6 billion cell phone users free query service, cell phone users can use the service, query my first 14 days to all the cities and municipalities information.