[Purpose/significance] In the risk landscape society created by the VUCA era, public health emergency in⁃formation disclosure is an indispensable action strategy to build a democratic and responsible government, protect the physical and mental health of citizens, and maintain the stability of social order. [Method/process] Using activity theo⁃ry as the analytical framework, this paper conducts an in-depth perspective on the elements and operating system of public health emergency information disclosure activities. On the one hand, the normative analysis method is used to explain the activity elements and system composition of public health emergency information disclosure; on the other hand, semi-structured interviews, government official website (official microblog), academic literature, policy docu⁃ments, media reports, etc. are used as data sources to conduct empirical discussions on the shortcomings and solutions in the operation practice of the public health emergency information disclosure system. [Result/conclusion] The cou⁃pling and complementation of six elements such as subject, object, community, rules, tools and division of labor consti⁃tute the operational element structure of public health emergency information disclosure; information production sys⁃tem, release specification system, task collaboration system and dialogue sharing system are an operating system struc⁃ture for public health emergency information disclosure was constructed. At the same time, targeted relief strategieswere proposed for the four major dilemmas existing in the operation of the four major subsystems: insufficient tool em⁃bedding, incomplete rules and regulations, unsmooth efficient collaboration, and inactive dialogue and communication.