Abstract: Summer primary production of seawater in Chinese Great Wall Bay, Antarctic during Jan.～Feb. 1994 was estimated. The results revealed that the yield of the carbon primary production was about 0.799g · m-3 · d-1 in the waters. We found that the yield in the deeper water column was fairly high as compared to the yield in the upper and middle columns. It showed that the deeper water surveyed lies still in the range of the euphoric zone. This meant that there was a quite high primary production in the waters. The yield of the gross production was rather consistent with the variates, such as. chlorophyll a, NH4- N,NO3-N, ΣN and ΣN/p. This seemed to indicate that there were sufficient nutrient salts there, which, however , was not consistent with the concentrations of NO2-N, PO4-P. This was not in coordination with the abundance of heterotrophic bacteria and suggests that these bacteria had a capability of degrading organic materials as well as strong mineralization.