Abstract: In order to study the change in nutrient composition of Antarctic krill with the month,the Antarctic krill harvested in the Antarctic 48.1 area from March to August 2016 was used as the material to determine the contents of basic nutrients such as water,protein,fat and ash. Amino acid content was determined by amino acid analyzer,and the fatty acid content was measured by gas chromatograph. The nutritional value of Antarctic krill was analyzed and evaluated systematically of to provide reference for the processing and utilization of Antarctic krill. The results showed that:protein content Antarctic krill ranged from 13.07% to 15.15%,and fat content ranged from 1.13% to 4.36%,both showed the same trend with the month,and reached the highest in April. Amino acid analysis results showed that,the total amino acid content(T)ranged from 99.83 to 151.33 mg/g and the essential amino acid content(E)ranged from 41.63 to 64.66 mg/g. E/T and E/N values(N represents the total amount of non-essential amino acids)were higher than the ideal protein conditions proposed by FAO/WHO,and the T and E values in April-June were the highest. In each month,the EAAI of the Antarctic krill was close to 1,and the proportion was balanced. Proline was the limiting amino acid. 29 kinds of fatty acids,19 kinds of unsaturated fatty acids were detected in Antartic kill,accounting for more than 60% of the total fatty acids,mainly including C16:1,C18:1n9c,EPA and DHA,total saturated fatty acids(SFA)content from March to August showed a gradually increasing trend with an increase of 2.34%;the value of ω-3/ω-6 was between 2.96 and 4.37,and the ratio was appropriate. In a comprehensive analysis,the nutritional value of Antarctic krill from April to June was even higher. This stage could be used to harvest Antarctic krill.