Abstract: In this study, the method of weighting was adopted to calculate the corner dimension.The average triangle method was applied to obtain characteristic quantities of radar-graph and eliminate the short-board effect coefficient λ to structure the perimeter evaluation vector.It can simplify the optimization of comprehensive evaluation function on shortcomings of traditional radar chart method.Then the optimized traditional radar-graph was utilized in the comprehensive evaluation of appearance quality of flue-cured Tobacco's upper leaves in different Nitrogen treatments of Panzhihua.The results showed that the optimization radar-graph method could obtain the only consequence which was better than the traditional radar-graph method.The quality sort of sample's appearance quality by optimization radar-graph method was consistent with Index sum method while the optimization radar-graph method could express richer and more intuitive information than Index sum method.