Abstract: The paper aims to introduce more germplasm of Eucalyptus grandis and improve its genetic diversity. The growth traits of 173 families from 11 provenances in central south Yunnan were analyzed. The variance analysis results showed that there were significant differences of the studied traits among provenances and families at four ages. TheF value among blocks decreased with age. There were significant differences of the studied traits among blocks at 16, 28 and 41 months while no difference was found at 53 months. The phenotypic and genetic variation coefficients of diameter at breast height, height and volume were 23%-46%, 19%-30% and 60%-75%. The genetic variation coefficients were lower than phenotypic variation coefficients of the studied traits. The correlation analysis showed that there were significant positive correlations etween the studied traits and ages. The correlations of the traits of the same age were ranged from 0.84 to 0.94. The correlations of the traits of different ages decreased with time span. Comprehensive selection results showed that provenances from QLD Copperlode, QLD Bambaroo and Leshan Sichuan Province had best growth while provenances from QLD Ravenshoe, QLD Tinaroo and QLD Tully Gorge National Park had slow growth.