Associated with the postwar years of spectacular economic growth, the reclamation in inner bays progressed and a lot of eelgrass faded and vanished. It takes effort to return the diversity of the biological community in the eelgrass ecosystem and the relations between eelgrass and humans.As to putting sustainable coastal environment utilization into operation, the shortest way is to put the sea to people's eye level.Observing the sea can provide access to guidelines for coastal environment conservation as well as to produce a diversified learning effect in environment education.