The nutritional value of new hatched Artemia nauplii of six geographic strains ( CangZhou, HeBei; HuangHua.HeBei; WuDi, ShanDong; CuoLe, Tibet; XiLinHaoTe, Inner Monglia; BaLiKun Hu,XinJiang) in China was examined. The protein contents of the nauplii were 46% - 53% of dry weight , and the lipid contents were 21% - 26% of dry weight. 17 kinds of amino acids of the nauplii were detected. The content of total amino acids was 38% - 44% . The percentages of the essential amino acid in total amino acid were 48% - 50% . The six strains nauplii contained abundant 20: 5n - 3 and a small amount of 18: 3n - 3. They were marine type. Compositions of the fatty acid were different among Artemia nauplii of the different strains. The contents of 18:2n -6 and 20:5n - 3 were significantly affected by producing area. The contents of 20:5n - 3 from Cuole, Tibet and Xilinhaote, Inner Monglia were 23.52% and 7.90% respectively ,which were the highest and the lowest in the six strains. 22: 6n - 3 was not detected in the strains.