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With the aim to establish the floristic list and to study natural regeneration of Amber Mountain, phytosociological investigation was carried out on 15 samples (50m×20m) in 4 different sites.In total, 239 species were identified which are distributed in 160 genera and 73 families. 159 0fthese species are endemic (66.52％). EUPHORBIACEAE is the most important family with average of 32.11％ F.I.V. between samples, representing 9.88％ of total species with a high value of specific diversity.RUBIACEAE is the family that has more endemic species. Among the 4 studied sites Sakaramy has 69.5％ endemic species and Antsalaka has many families that are not found in other sites. Diversity index showed no difference between the samples.