Abstract: Social media platforms are important platforms for public opinion expression and information dissemination, but they are also fertile soil for the dissemination of harmful information. The roles of government, enterprises, and users in the governance of harmful information on social media platforms are considered, a three-party evolutionary game model is constructed, and the optimal strategy and the effective mechanism for the governance of harmful information by the three parties are discussed. MATLAB is used to simulate. The results show that the following measures can accelerate the evolution of the strategy selections of actors to the ideal state of government supervision, use of proper technology by enterprises and user self-discipline: the government strengthens the punishment for enterprises that fail to prevent harmful information, or increases the reward for enterprises to spread high-quality information; the government and enterprises strengthen the punishment for users who violate information dissemination laws and regulations and spread harmful information; enterprises enhance the combination of marking information source technology and user rating system to reduce the additional cost of using technical management means; users learn to mark the source of the posted or forwarded information and understand the detailed rules of the rating system to restrict their information release behavior in order to reduce the cost of self-discipline. Finally, suggestions on the co-governance of all parties to promote the healthy and orderly development of social media platforms are put forward.

Key words:  , social media platforms, harmful information governance, technical management, evolutionary game