The survey on the resources of benthic algae was carried out in Naozhoudao in spring from 2003 to 2005.The composition and biomass of them were studied,and the ecological distribution sections of every alga were summarized.The results are as follows:1.56 genera,87 species of them were found.They are identified as: 3 genus,4 species in Cyanophyta;14 genera,27 species in Chlorophyta,32 genera,44 species in Rhodophyta,7 genera,12 species in Phaeophyta.2.The number of species in Tanjing was the most.3.The quantity and distributing of species among months were different.4.On the average biomass in Tanjing was the most in Mar.;Dalang was the most in Apr.,and Cunliang was the most in May.5.The algae were chiefly distributed in middle intertidal zone and lower intertidal zone.