Abstract: Based on the 18 phenotypic characteristics data of 729 trees of 24 populations of Melia azedarach in China distribution area,the principal component and cluster analysis have been made.5 phenotypical districts and 10 sub-phenotypical districts were founded.Canonical discriminant analysis showed significant differentiation among phenotypical distributes,but not for within phenotypical distributes.In order to interprete whether the 5 phenotypical districts are reasonable,Canonical discriminant analysis has proved 93.8 percent historical data correct.The phenotypic allocation of Melia azedarach provides a science foundation for germplasm resources conservation,reasonable sampling,diversity assessment and a guidline for seedling optical allocation.