Mangrove ecosystem plays significant role in marine ecology. The study focused on the status of mangrove ecosystem at Buenavista, Looc, Romblon. The method used was descriptive survey, and the data needed were gathered using the transect and quadrat method. The statistical tools used in this study were relative measurement, Analysis of Variance (ANOVA) and Duncan Multiple Range Test (DMRT). The result of the study revealed that preserving the mangrove ecosystem would help the residents determine the benefits given by mangrove species in that area and its importance to marine ecosystem, the volunteers who implement the rules would benefit and also the residents living near the coastal area, the mangrove ecosystem of Buenavista was still in good condition. Analysis of Variance showed that there is significant difference on the four (4) mangrove species in terms of: frequency of occurrence, relative frequency, relative density, relative dominance and importance value. Likewise, there is no significant difference on the four (4) mangrove species in terms of: quadrat of occurrence, number of trees, basal area, percent crown cover, average height and regeneration.