The invertebrate community and its diversity in the intertidal zone in Yantai have been studied.The results show that there were 128 species of invertebrates there.The dominant species of invertebrates were Chthamalus challenger,Pycnodonta Plicatula,Ruditapes philippinrum,Macoma incongrua,Umbonium thomasi and Orchestia sp.The diversity showed a droping trend as time order.However,the community diversity of invertebrates living in the silt was rising slightly.The diversity of the habitates in rock and gr...