Abstract: The outbreak of Covid-19 challenged the university libraries to deal with public emergencies. Investigation and analysis of the response measures of university libraries will help us to fully understand the current situation and accumulate experience for the future. By adopting the network survey method and based on the posts published by 42 “Double First-class” university libraries on their internet and WeChat official accounts, this paper analyzed the publicaiton date, content and typical cases. We learned that all the university libraries had made quick response, and given full play to the advantages of “resources” and “services”. They did a lot of work in the field of “remote access”, “collection of free resource during Covid-19”, “reading and appreciation”, etc. The service content has been changing with the evolution of epidemic and that of the users’ demand. At the same time, we also noticed that most libraries did not have a systematic emergency plan, which needs to be strengthened in the future.