These Based on the analysis of recent patents, the evolution regularity of the published article number and features of internet public opinion events, it was put forward that multimodal evolution model of cellular automata by using multi-agents simulation technology and given simulations about a peak event of internet public opinion of hunan university professional title evaluation bribery, and secondary peak event of xiangtan vice director who was the generation after 90s. The simulation results well represented public opinion evolution process of events. Finally, it showed that the credibility of local government performance played an important guiding role in internet public opinion evolution by adjusting the parameter of it.