Abstract:As an important fortress for joint prevention and control of COVID-19, the community plays a key role in controlling the source of infection, cutting off the route of transmission, and protecting susceptible people. Based on the participatory observation of the“Quartet Guarantee”management action for the early emergency prevention and control of COVID-19 in the Xinlonghu com⁃ munity of Changzhou, the practice model of the party and government cadres, medical forces, police forces, social worker group and general public in collaborating to respond to COVID-19 is explained, where the community is serviced as the basis of home isolation for emergency management and control. It is discovered that the powers and responsibilities of emergency subjects are not equal, in⁃ centives are not paid attention to, the integration of emergency process is not ideal, and the community’s autonomous and active re⁃ sponse capacity is weak. The optimization of the collaborative linkage mechanism from the six aspects is proposed, which includes system guarantee, supervision and evaluation, information linkage, resource allocation, flexible incentives, and joint mediation. Then the “three basic goals” and the “six expected results” are achieved. Finally, the above practices are expected to provide strate⁃ gies to improve the mechanism of joint prevention and control the magnitude outburst public health incident and construct the order of public health in communities.