Résumé : Boundary structure is an important factor for significantly influencing the settlement of microalgae. In order to investigate the effect of boundary structure on the antifouling performances of biomimetic textured coatings, three different boundary structures were fabricated via biomimetic replication method and evaluated by recording the settlement amount of fouling microalgae including Nitzschia closterium f. minutissima, Phaeodactylum tricornutum and Chlorella. The results showed that imbricate boundary structure was more positive for antifouling, but depressed boundary structure and raised boundary structure played a negative role for antifouling. Especially, the depressed boundary structure displayed the worst antifouling performance which attributed to providing shelters for microalgae. The antifouling mechanism of microalgae settled on the biomimetic textured coatings with different boundary structures was revealed deeply.