Abstract: In recent years,several plans to build coal-fired power plant lead to public boycott in China,which lead the national thermal power energy projects are hard to be completed on time. Therefore,taking Pingjiang coal-fired power event as the example,we analyze people's changing attitudes towards the government propaganda. Then based on SIR epidemic model,simulation analysis on the public support rate is carded out. Finally,government propaganda is evaluated from the Gini coefficient. The results show that epidemic model can reflect the dynamic change process of public support,and government propaganda acts as a medium to promote this process. The Gini coefficient of government propaganda is G=0.375<0.4,which is reasonable,but also has the optimization space. This paper discussed the effect of the government propaganda from a case,and put forward the proposal and the countermeasure from the decision-making mode transformation and the propaganda strategy implementation for the NIMBY project,especially coal-fired power plant.