In this paper, varieties of methods that find optimal solution from many non-inferior solutions of the multi-objectives optimal designing are discussed, and a method of soluting a shapes difference problem from orders of non-inferior solutions by grey system incidence degree is provided. A place difference probelm from orders of non-inferior solutions is soluted by Hamming distance and closeness degree in the fuzzy Math. , and its are merged, get a concept of the similarity-close degree and determine optimal solution from many non-inferior solutions.