For more knowledge on genetic diversity flax germplasm, 11 quantitative traits of 341 flax germplasm resources were investigated by multiple statistics analysis. Results showed that genetic diversity index ranged from 2.000 to 2.069. Diversity of different traits varied. The variation coefficient of stems per plant was the highest (42.51%), and that of mature days was the lowest (4.18%). Among the paired traits, 19 had highly significantly positive correlation, 16 had highly significantly negative correlation, 3 had positive correlation and 2 had negative correlation. Results showed that the 11 characteristics could be simply clarified into 4 independent principal components, including thousand-seed weight, effective fruits per plant, flowering days and main stem branching factors providing 76.48% of all information. By using these 4 principal component factors of system clustering, 341 flax germplasm were divided into 5 groups. Among them the group Ⅰ and Ⅲ had better synthetical properties, with more stems per plant, more branches per main stem, more fruits per plant, more seeds per fruit and greater grain weight per plant.