Kinho J, Halawane J, Irawan A, Kafiar Y. 2015. Evaluation of plant growth on progeny test ebony (Diospyros rumphii) age one year in the nursery. Pros Sem Nas Masy Biodiv Indon 1: 800-804. Diospyros rumphii Bakh., is one species of commercial timber where known as ebony. This species has a high economic value, so that the main attraction to the local people and industry to be exploited. This species has characterized on slow growing thus it is the limiting factors. Nowadays, condition of this species in nature are decrease and fear to extinction. This condition were caused by massive exploitation in the past. One of efforts to maintain the existence of these species is by conservation of genetic resources. This study aims to determine the genetic variation of growth and assess the value of plant genetic parameters of ebony (D. rumphii) age one year in the nursery. The methode of this research was randomized complete block design by using 22 families, 4 tree plot and 12 block. The results showed that family or the source of mother tree have significant effect on height and diameter growth, which suggests that they have genetic variations in height and diameter growth of the test plants on progeny test of ebony age one year in the nursery. Estimated heritability of individual parameter values on height and diameter was 0.59 and 0.65. The value of heritability family on parameter high and diameter are 0.97 and 0.89. Genetic correlation between height and diameter parameter is 0.89 while the phenotype correlation is 0.50. Based on the breeding value, there were six best family have stable in height and diameter growth performance namely; family 15, 14, 11, 12, 13 and 22.