To evaluate 30 leaf mustard germplasms, 11 phenotypic traits were investigated and measured. The data were analyzed by cluster analysis and principal component analysis to study the genetic diversity. The results showed that the average coefficient of variation of 11 phenotypic traits was 44.74 %, leaf number was the largest and the coefficient of variation was 150.80 %, and the smallest coefficient of variation of the percentage of net vegetable was 9.54 %. 24 leaf mustard germplasms were divided into three categories through cluster analysis and there was a wide genetic distance between each categories. The 11 phenotypic traits were consolidated into 5 principal components which accounted for 86.62 % of total cultivars. The results clearly defined the phenotypic specificity and genetic diversity of leaf mustard germplasms, which screened some specific leaf mustard resources to provide the basis for the higher yields and improved quality breeding.