There are many uncertainties of the tennis players' performances. In order to better evaluation to the players, in this passage we use the comprehensive assessment of fuzzy mathematics to analyze the tennis player's performances, which mainly includes the game technical, competition consciousness, physical quality and psychological quality in the field. We come to the evaluation matrix by means of the model and then we get the range of the changing scores of the tennis play. Although the

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... are not so certain, we can still get the exact variation range and though all the factors we can get the sections of the changing scores. Thus we can choose the tennis player and begin our analysis.