There is no blue health code in Beijing. At present, the health codes in most areas are three colors, green, yellow and red. The blue health code is the health code in Shantou area. The health code in Shantou area is blue for people with normal body temperature and red for people with fever. In low-risk areas, people with green code and blue code can pass through high-risk areas smoothly and travel according to the regulations of the local prevention and control headquarters. People with yellow code shall not be released, and people in red team shall be treated and isolated on the spot according to the requirements of epidemic prevention and control.