Cendana (Santalum album Linn.) is a species that has a high economic value because of the essential oil content in the heartwood. The high economic value in the heartwood had pushed exploitation action to these species. Exploitation being offset by regeneration efforts has resulting in a decrease of its populations and genetic variation. The remaining genetic variation can be conserved through establishing Ex-Situ conservation stands which simultaneously fucntioned as basic populations for tree improvement purposes in the future. In 2013, Forestry Research Institute of Kupang has established an Ex-Situ conservation plot of cendana originally from Sumba island population. The research design was laid out in Incomplete Block Design (IBD) consisting of 57 families, single treeplot and 5 replication with a spacing of 4 x 4 m. This study was aimed to investigate the characteristics and the influence of genetic factors on the characteristics of cendana of Sumba Island population until the age of 6 months. The result of study showed that the average growth of height and diameter are 37.36 cm and 3.88 mm, respectively. The estimate family heritability (h2f) for height and diameter are 0,80 and 0.55, respectively.