Abstract: Purpose/Significance Group emotion has a profound impact on environmental conflict. Design/Methodology The Rank Dependent Expected Utility Theory (RDEU theory), combined with the evolutionary game theory, is introduced to construct the RDEU game model of risk environment group events for the purpose of exploring the evolution mechanism of such events under the influence of different emotions. Findings/Conclusions The results show that given the rational government, the general public tends to cooperatively deal with conflicts of interest when optimistic while choose aggressive strategies when pessimistic, and the influence of pessimism outweighs that of optimism on decision-making behavior. Given that both parties are emotional, the decision-making behavior, influenced by the player’s own emotion and the other player’s strategic orientation, proves to choose the one with the maximum benefit. For example, after perceiving that the other player chooses an offensive strategy below a certain threshold value, the player tends to choose confrontation with the increase of emotion index. Finally, the conclusion is validated by the numerical analysis of MATLAB software.