The agronomy traits indexes of 40 garlic cultivars were Investigated based on the principal of numerical classification, and the PCA of 16 agronomy traits and 5 quality indexes were analyzed, the scatter plot were drawed based on the first 3 PC and the clustering were carried out based on the genetic coefficient. The first 7 PC accounted for 85% variation among the cultivars. The 10 excellent cultivars were selected based on the principal component. The 40 cultivars can be classified into 4 groups when SM coefficient was 0.12 on the UPGMA dendrogram. The clustering based on the 0.07~0.64 SM coefficient explained the genetic relationship of 40 cultivars.