Using the seed kernel of Sapindus mukurossi producing biodiesel is one of the hot areas in biomass resources industry at present. In order to select high oil yield plus trees,the oil contents in seed kernels from 61 S. mukurossi plus trees were measured,which come from Fujian,Jiangxi,Zhejiang,Anhui,Hunan,Guangxi and Yunnan provinces. The cluster analyses were carried out on 29 plus trees that oil contents in seed kernels were above the average of the 61 plus trees. Meanwhile,the effects of tree-age,height,d...