This paper presents results of study on the species composition, distribution of biomass, density and communities of the macrobenthic infauna in Jiaozhou Bay using materials collected during May 1991-february 1994 at 10 stations. 200 species of macrobenthos were collected: Polychaeta 78 species; Crustacea 57 species; Mollusca 40 species; Echinodermata 11 species; and 14 other species. The average total biomass was 71.9g/㎡. The biomass of Polychaeta, Crustacea, Mollusca and Echinodermata were respectively 5.4 g/㎡, 2.9 g/㎡, 44.9 g/㎡ and 12.4 g/㎡. The average total density was 132.0 ind/㎡. The density of Polychaeta, Crustacea,Mollusca and Echinodermata were respectively 46.8 ind/㎡, 27.5 ind/㎡, 33.1 ind/㎡ and 6.3 ind /㎡. The biomass maximum (131.4 g/㎡ ) occured in spring, the minimum (33.8g/㎡ ) in winter. The biomass in autumn and summer was 72.1 g/㎡ and 42.1 g/㎡ respectively. The highest (148.6 ind/㎡) density occurred in summer, the lowest(86 ind /㎡) in autumn. The density in winter and spring was 136.2 ind/㎡ and 130.8 ind /㎡ respectively.