This study was conducted in February 2017. This study aimeds to understand structure community of mangrove in the village Pantai Cermin Kiri in the Pantai Cermin North Sumatra. Methods used in research was method of survey. The research station based on human activity. In every station divided into 3 transects with long transects 50 m lead from the sea to land. The was number of a plot used by …