Seagrass is the only angiosperm on earth that can completely live in seawater. It is also known as the three typical offshore marine ecosystems with mangroves and coral reefs. It has important ecological functions, such as sequestrating CO2, maintaining biodiversity, Fixing beaches. Human activities have caused serious degradation of seagrasses globally, and some seagrass beds have even appeared “desertification”. In recent years, protection and restoration of seagrass beds has become a recognized hotspot in the world. At present, seagrass restoration projects have been carried out in Weihai, Dongying, Qingdao, Hebei Tangshan, Guangxi Beihai and other places, providing good habitats and foods for marine animals and birds as well as sequestrating CO2.