Abstract：The intertidal cirripod community structure in Beiji archipelago w as investigated, the cirripod community structure is belong to hight salty ones,and is very simple. The Shannon- Wiever diversity H′( S) , Pielous species index (J ) , Margalef species abundance index (d ) and McNaughton dominant degree (D) are used to conduct the numerical analysis of species diversity of benthic cirripod community
in rocky intertidal zone of Beiji archipelago. The results show that,from North to South,
the values of H′( S) , J and d have an increasing trend, and D is in reverse. In each sam pling section, bigger values of H′( S) and J appear in Spring and Summer, that of d appears in Summer and Autumn,
and D value is different for each section.