Being influenced by COVID-19 epidemic, a series of response measures were taken by Ningbo Library after closure including prevention and control emergency management, ensuring the book-circulation service, organizing online promotion activities, providing information for reference and decision-making, and ensuring that equal attention has been attached to epidemic prevention and control and professional service, and to meet the needs of readers as much as possible. These measures fully reflect the social core value of the public libraries in the special period, the professional spirit of librarians and the professional ability of this industry. In the post-epidemic period, public libraries need to take some further measures to promote development, such as innovating service mode, strengthening alliance and cooperation, optimizing resource structure, improving talent structure, and furthering service contents.