The decision-making problem for multi-objective optimization is studied in this article.By defining regret value in regret-function and designing the objective function,the priority degree for each object can be quantitatively expressed.The simulation results show that the objective function based on regret-function is of universal use in multi-objective optimization.Compared to the traditional way,it doesn't have to try over and over to find a proper weight.Besides,it can approach the ideal objects' value ...