To fight against climate change, one of the most important ways is that of reconstituting or rehabilitation of forest cover destroyed by human activities. The Banco National Park is a typical example of managed forest, because it having undergone silvicultural enrichment with many timber species which, niangon (Tarrietia utilis Sprague) introduced by Martineau method. Thus, 10% of the 20 ha plantation of this species were sampled in the Banco National Park that in 2 ha distributed on 8 plots of 0.25 ha. The collected parameters concerned stems quality, their status and health conditions. It appears from this study that the niangon behaves quite well in the Banco National Park despite the absence of maintenance after the establishment of plantations. Indeed, on 199 feet met in 2 hectares inventoried, approximately 44.5% are emerging in relation to surrounding trees and almost all of the trees are healthy (99%). The average height of the stem is 12.8 m with an average annual increase in diameter of 0.55 cm. The Martineau method can therefore be considered as niangon enrichment technology for a sustainable management of this commercial species.