In order to facilitate the production and life of enterprises and employees, Shandong public security organs have further strengthened measures such as "online office, handheld office and appointment office", so that related problems can be handled and solved without meeting or contact, and strive to write excellent answers to promote enterprises to return to work, so as to promote stable economic and social development with all-round service and "safe supply". Building an epidemic prevention barrier is the key to a strong and orderly resumption of work and production. Leveraging big data, Rongcheng Municipal Bureau of Industry and Information Technology innovatively uses the "Enterprise Code Pass" system to help returning workers enter and leave the community and the factory in real time to achieve closed-loop management. /kloc-since March, 2008, eight supervision teams composed of staff from four departments, including Rongcheng Municipal Bureau of Industry and Information Technology and Emergency Management Bureau, have also sunk to the front line, providing one-on-one supervision and face-to-face service to enterprises that have resumed their work, inspecting more than 542 enterprises that have resumed their work in various towns and streets, and finding and rectifying 6 14 problems.