Mangrove is one of vegetation on coastal where very important. The aim of research is to know the structure of community of mangrove forests in Dalapuli Barat Village Pinogaluman Sub-district, Bolaang Mongondow Utara District. The method to take the sample in this research is transek square method. The first sample plot is on the left of the path axis and the second sample plot is on the right of the path axis and then alternates. Sampling growth of 2 m x 2 m for the seedling phase, ie regeneration of trees that begin to increase until the power 1.5 m up to Index diversity of analysis result islow.Keywords : Mangrove, Community, Dalapuli Village