The peak of the epidemic in Xi'an was December 9. From December 20, Xi'an citizens need to go to work with a negative nucleic acid test report within 48 hours. However, the Xi'an One Code Pass was inaccessible, and many citizens could not go to work because their nucleic acid reports could not be checked. Some local companies made their employees swear that they had taken a nucleic acid test before they could enter the door. There were also long lines at subway entrances because citizens could not scan the code to enter the station. And the previous suggestion of Liu Jun, the director of big data in Xi'an City, to not light up the code for non-essentials, has also sparked some controversy.