In order to make thermal power units adapt to the new environment and energy situation,the paper defined threeobjectives,namely,economy,environmental protection and rapidity,and established the optimal load distribution models based on respective targets. By combining NSGA Ⅱmethod and TOPSIS theory to solve this problem,the collection of non-domination set was obtained. A case of load distribution optimization for four units was also given in this paper. The simulation results verified the rationality of th...