This article tries to study how to prevent the spread of fake news which has harmed the democratic society in Taiwan. Comparative analysis method is used to compare the spread and prevention of COVID-19 and fake news. Finally, the ways to prevent the transmission of fake news are put forward. In addition to the actions of platform operators, fact checking needs more attention. The author also appeals to the public to contribute money, expand donation or join the volunteer inspection team, act as an expert consultant, expand the inspection manpower of the fact checking center, and work together for Taiwan's excellent news environment.