Opinion Evolution under Media Influence Based on Improved Deffuant Model

In the context of the gradual development of communication technology and social software, adverse public opinion trends can cause social unrest. In this case, the study of the evolution of group opinion and then intervention in the formation of public opinion is an urgent problem to be solved. Individuals' opinions on social platform are not only changed by inter-individual communication, but also influenced by various media propaganda. In order to explore the process of opinion evolution within a group, this paper proposes an improved Deffuant model with the influence of media propaganda. Different from the existing models, in order to simulate the real process of opinion evolution, the improved model takes into account the differences in the cognitive level of individuals, the memory effect of the formation of individual opinions and the real-time updating of the individual interest and the level of authority in the media. The analysis of the simulation results shows that: 1. a group with a higher level of trust is conducive to the stability of the whole group and the unity of the group's viewpoints 2. it takes a period of time for public opinion to ferment after the occurrence of a hot event in the group, and the earlier the intervention takes, the more effective the publicity and guidance will be 3. the opinion evolution process in the improved Deffuant model is in line with the cycle of the development of the public opinion in the real world.