Abstract: 【Purpose/significance】In the context of the covid-19 epidemic, there are many network rumors that affect the network envi?
ronment and social order. It is of great significance to study the groups related to the spread of rumors in the real society.【Method/pro?cess】Based on the study of theoretical knowledge of network rumor under major epidemic, this paper constructs a tripartite evolution? ary game model of government, network operator and rumor maker. According to the prospect theory, the difference between perceived value and actual value is brought into the tripartite evolutionary game model to optimize the practical significance of the model, and simulation is carried out through system dynamics software.【Result/conclusion】Whether the three-party game can reach the optimal stable point is only related to the sensitivity of the rumor's perceived value, and with the change of the sensitivity of the perceived val? ue, the results of the three-party game will be unstable or stable at other non-optimal stable points. Finally, the paper puts forward some suggestions on the control of network rumors.【Innovation/limitation】The innovation of the article lies in the addition of prospect theory and traditional expected utility theory to the evolutionary game model, which increases the rationality and preference of deci? sion makers, and is more in line with the actual situation of public opinion.