Study of floristic diversities has been done in Konawe Utara, Southeast Sulawesi. The aim was to determine the species composition and vegetation structure. The current study was conducted by using several sampling plots. The results showed that the 62 species in 49 genera and 30 families were recorded. The species richness of trees (DBH or Diameter at Breast Height ≥ 20 cm) was 35 species in 31 genera and 24 families, dominated by Manilkara fasciculata. For poles (10 < DBH < 20) reaching 37 species in 34 genera and 24 families were dominated by Helicia serrata and Ixonanthes petiolaris. For saplings (1 < DBH ≤ 10) consisting of 47 species in 41 genera and 26 families were dominated by I. petiolaris and Lasjia hildebrandii, while the seedlings were covered by Castanopsis buruana and Agathis dammara. Tree density of trees, poles, saplings and seedlings ranged from 268 to 39,667 individuals ha−1, while the basal areas without seedling were around 13.15–29.6 m2 ha−1. Indexes of species diversity (H’), dominance (C), evenness (E) and richness (R) ranged from 3.15–3.52; 0.04–0.06; 0.89–0.95, and 6.03–8.88, respectively.