Abstract: One of the important channels for genetic improvement is to choose clones of excellent performance.The results of selecting clones showed that there was highly significant difference in thousand seed weigh,seed yield per unit area and seed oil ratio of phenotypic excellent clones of Podocardpus nagi. Their repeatability was 0.885,0.784 and 0.804 respectively,which was necessary to choose.Compared with the overall level of sampling groups according to the comprehensive performance of three main economic traits,four clones of excellent performance were selected carefully i.e. SM2,NS1,NY2 and SM1 with stronger adaptability and higher stability.The genetic gains of thousand seed weigh,seed yield per unit area and seed oil ratio were 15.68%,0.62% and 5.55% respectively,but 32.38%,638.10% and 10.68% compared with CK by the method of cluster analysis.The site conditions of Types Ⅰ and Ⅱ are suitable for the clones of NS1 and Sm2 and the site conditions of Types Ⅰ,Ⅱ and Ⅲ for NY2 and SM1.

Key words: Podocardpus nagi, species of bio-oil energy, detecting clones, selecting clones, analysis of stability