The decrease of mangrove ecosystem in the coast Labuan Uki bay loak subdistrict, bolaang mongondow province caused by conversion land on each parts of mangrove become industry area and people residance. It's has effect to fish production, when there has low area of mangrove aqual to fisherman income. It means that, mangrove has no fungsion as development facility of marine biota will give the effect to the organism in that area.To make protection to mangrove ecosystem area in the bay of Labuan Uki. The researcher do the research of mangrove ecosystem based society by village decision. To know the wide and the study case of useless in labuan uki area. The result of this research to analys using qualitatife description method.The result of this research to give information to the researcer about the village regulation able to accept by villager with one hundred percent (30 persons total respondents). Than in the village regulation is kinds of mangrove ecosystem protection based society that purpose to the cuntinue basic development in the bay of labuan uki and have been to apply solid system and partnerships. And the wide of mangrove about ± 241.75 ha. In there has genus Rhizophora, genus Sonneratia, Genus Bruiguera and genus Avicennia. But the most genus in Labuan Uki is dominate of genus Rhizphora. In this case has to identificate effect of this problem that is to find out location of it. For the first in Sauk village dusun 1 the wide about ± 7.500 m2 as a talung conversion area. Secondly batubara II village dusun 3 the wide about ± 204 m2 and ± 3 ha. To conversion as location to make residance and fishpond area. And the last Labuan Uki village dusun IV the wide about ± 3 ha and about ± 3 ha. To conversion as fishpond area and PT. BETAGAS factory area.The key : defect case, mangrove, joint village regulation