Abstract: In order to develop the multi-trophic Integrated Aquaculture System (IMTA), the composition and spatial characteristics of the annual changes of benthic macroalgae community in the intertidal zone of aquaculture sea area at Xiasanhengshan Island, Shengsi, Zhejiang Province in 2019, were investigated. Results showed that a total of 36 species, including 24, 4 and 8 species of Rhodophyta, Chlorophyta and Phaeophyta, were collected in the research area and the community structure changed significantly with seasons. Sargassum thunbergii, S. fusiforme, Ulva lactuca, Grateloupia turuturu and Laurencia composita dominated at all 9 sites in sea area investigated, and S. thunbergii was the dominant species occurred in all seasons. The annual averages of Margalef index (D), Shannon index (H′) and Evenness index (J′) of the macroalgae are 0.81, 1.85 and 2.33, respectively, with obvious seasonal changes. The Pearson correlation analysis of dominant species showed that G. turuturuand L. composita had very significant correlations with chlorophyll a, temperature and salinity. The biomass of G. livida and Chondrus ocellatus correlated very significantly with dissolved oxygen.Corallina officinalis correlated significantly with dissolved inorganic phosphorus and pH, and S. horneri correlated significantly and inversely with temperature. U. lactuca correlated significantly with COD, pH, salinity and chlorophyll a. The biomass of S. fusiforme had a very significant correlation with chemical oxygen demand. The dominant species with commercial value of S. fusiforme, S. thunbergiaand U. lactuca can be used as candidate species in the IMTA system. This study lays a theoretical foundation for the development and optimization of the fish-shell-algae integrated ecological aquaculture model in future.