Duabanga sonneratioides Buch.-Ham. is a large timber species with high yield and good quality that has been strongly exploited. In order to contribute to the conservation and development of this species, the article provides the research results on the silvicultural characteristics of Duabanga sonneratioides, which are naturally distributed in some northern mountainous provinces (Dien Bien, Son La, Ha Giang, Phu Tho). The article used survey method on 12 transects (3 transects/province x 4 provinces), the minimum length of each transect is 5 km/province and studied on 20 typical sample plots, temporarily with an area of each sample plot of 2,500 m2 (50 m x 50 m) in the state of poor forest, very poor forest, medium forest, and rich forest. Research results show that: (i) Duabanga sonneratioides is a large tree species, naturally distributed on many different types of soil, but the best soil is gray ferralit, yellow-gray, with light to medium texture. Duabanga sonneratioides is distributed in places with elevations from 210 to 843 m, slopes from 10 to 400 , average temperatures from 20.10 C to 21.50 C. Average air humidity ranges from 75% to 83%. Rainfall ranges from 1,148 to 2,155 mm/year. The forest states, where Duabanga sonneratioides species are distributed, contain mainly Stereospermum colais, Aphanamixis grandifolia, Ormosia balansae, Pterospermun diversifolium, Croton cascarrioides, Sterculia lanceolata... (ii) the regeneration probability of Duabanga sonneratioides under the forest canopy is not high, accounting for only 2.75 to 3.56% of the total regenerated trees in the studied stands. Especially, when the number of regeneration trees was larger, the number of Duabanga sonneratioides decreased in all study sites. Duabanga sonneratioides almost do not regenerate naturally under the mother tree canopy. (iii) In nature, Duabanga sonneratioides is often accompanied by some species of Anthocephalus indicus, Croton cascarrioides, Euphorbia tirucalli, Stereospermum colais, Adenanthera microsperma, Ormosia balansae, Pterospermun diversifolium and others.