Abstract: In the new era, in the face of frequent urban disasters, an empirical analysis of the information behavior of public network participation in emergency response can help the effective performance of emergency management decision-making. Taking the typical urban disaster of the July 20 extremely heavy rainstorm in Zhengzhou City as an example, we collected relevant textual information from the public on the microblog platform, analyzed and summarized the information behavior characteristics of public online participation during the life cycle of the extremely heavy rainstorm through content sampling, and then discussed the strategies for improving the information behavior norms of public online participation in urban disaster emergency response. The study shows that microblogs organically connect the information behavior of public participation in urban disaster emergency response in a ubiquitous environment, which makes public online participation information behavior to be typical process and interactive information dissemination, and it is necessary to conduct an in-depth investigation on the corresponding legal system, resource guarantee system and information literacy education in the future.