Abstract: [Objective] The aim of this study is to clarify the relations among the main indices of mulberry physicochemical quality in order to establish their scientific grading standards and identify the typical indices of mulberry physicochemical quality.[Method]With 13 varieties of fruit as the tested materials to determine total polyphenol, polysaccharide and other chemical indicators and using principal component analysis, cluster analysis, grey correlation analysis to determine the representative physical and chemical index.[Result]Soluble solids, total flavonoids, total acid, total polysaccharide, vitamin C, total polyphenol content were determined as the five representative indicators for mulberry quality evaluation.[Conclusion]The integrated use of principal component analysis, cluster analysis, correlation analysis and grey correlation analysis can simplify the mulberry quality evaluation index.