Due to survey data on benthic species composition in Cua Lo coastal area is limited, the article provides data on species composition, differences and distribution levels of benthic animals in coastal and island areas as well as contributing to completing research on benthic diversity and proposing management and conservation of biodiversity in the coastal area of Cua Lo (Nghe An) in particular and Vietnam in general. The research applies sampling methods in Cua Lo coastal area (Nghe An): Field research methods (collection methods, animal fixation and storage methods) and laboratory research methods (determination of nomenclature of types and data processing methods). Results of analysis of research samples have identified 86 species belonging to 3 main groups (Bivalvia, Crustacea and Grastropoda). Crustaceans have the highest number of species with 33 species, followed by gastropods with 29 species and bivalve molluscs with the lowest number of species with 24 species. 5 species with only identified genera should be kept as sp. (Grapsus sp.
Neoliomera sp.
Alia sp.
Olivella sp. and Gibbula sp.).