The observation data of 59 phenotypic (Quantity traits 24, Quality traits 35) of Taraxacum koksaghyz and its 10 sympatric species were analyzed through Variance Analysis, Factor Analysis and Cluster Analysis to reveal the phenotypic diversity of genus Taraxacum and the relationship between the species was also studied. The results showed that: （1）the coefficient of variation of quantitative characters of 13 germplasm resources was 7.50%-55.00%, and the average value was 28.25%, and the diversity index was between 1.157-2.032, with an average of 1.663. （2）The variation range of the coefficient of variation was between 20.40%-67.44%, and the variation range of diversity index was between 0.271-1.672, with an average of 1.136. The morphological diversity index of quantitative traits was greater than that of quality traits; （3）the cumulative contribution rate of the first 7 principal components is 84.767%, in the principal component analysis of 59 traits, and traits the floral morphological variation was a major factor contributing to the phenotypic differentiation of Taraxacum. （4）The results of Wards cluster analysis using Euclidean distance, 13 collections were divided into 4 groups at a genetic distance 7.5. The species collected from the same region tended to be clustered into the same groups, indicating close relationship, while the 3 collections of T. koksaghyz were clustered into 2 different groups showing distant relationships. The results showed that Taraxacum was a genus rich in both quality and quantitative trait variation, resulting phenotypic diversity.