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The putative best design is obtained by solving a multi-criteria optimization problem in robust design. The problem solved, the usually used weighted sum method may lose Pareto points, and the artificial selection of the weight is ambiguous, which may fail to obtain a desired design. So that, adopting an indifference point calculating weight, a more comprehensive preference aggregation method was implemented for the robust design. Using this method for wet multi-disc brake robust design with one and two performance variables respectively, the results indicate that this method can get allover Pareto with a simple calculation, and it can avoid the artificial blindly selection of the weight at the same time.