As a part of e-government system，government WeChat undertakes important tasks such as disseminating information，responding to social concerns，and meeting public information needs. The epidemic highlights the role of new government media in precision control and precision services. During the COVID-19 epidemic，government WeChat released various kinds of information，set up the epidemic agenda，and built the backbone of the epidemic information dissemination system. In this regard，this paper mainly focuses on the investigation of WeChat，analyzing their responses，issues and positioning in the epidemic events，and tries to explore the communication principles and problems of the new government media in major public health emergencies.