Abstract: Purpose/Significance Due to the multi-criteria decision-making issue in which the preference information acts as interval fuzzy number, a group decision-making method based on the minimized conflict is proposed. Design/Methodology Firstly, the maximum entropy model is constructed to solve the decision criteria weights with the overall optimal decision as the objective. Secondly, the optimization model is constructed to solve the decision-makers’ weights with the objective of minimizing the total decisional conflict degree. Then, the comparison possibility matrix and ranking vector model of decision alternatives are established to obtain the ranking result of decision alternatives. Finally, an investment decision-making example is given to verify the effectiveness and scientificity of the method. Findings/Conclusions The method can solve the conflicts in group investment decision-making and form the most consistent preference decision alternatives when making investment decisions.