The common oyster, common reed, and common eelgrass habitat, on the one hand, purify water by transforming toxic substances into other organic matter through their organism. On the other, they can catch sediments that provide nutrients for different microorganisms. The habitat creates places for diversified species to forage, breed, and shelter, thereby increasing biodiversity. In this way, the reduction of pollution and enrichment of sediment can effectively mitigate coastal erosion, expand wetland and promote a virtuous cycle of the entire ecosystem.