Abstract: The nutritional components of Thymallus arcticus was determined by conventio- nal and biochemical analytical methods.The results showed that the content of moisture,crude protein and crude fat,crude ash in fresh muscle of Thymallus arcticus were 69.38%,20.41%,0.78% and 1.26% respectively.18 amino acids were found in the muscle,the total content was 59.37 g,and the contents of essential amino acids( EAA) and umami amino acids( DAA) were 39.95% and 39.13% respectively.The limiting amino acid of Thymallus arcticuswas threonine,its SRC was 85.45.8 amino acids were found in the muscle,unsaturated fatty acids accounted for 64.14% on the total fatty acid content,and the content of polyunsaturated fatty acids docosahexaenoic acid( DHA) and eicosapentaenoic acid( EPA) were 0.21% and 2.73%,respectively. The above data showed that Thymallus arcticus was high in protein,low in fat and most of fat were unsaturated fatty acids.in addition,Thymallus arcticus also contained a large number of trace elements which was beneficial to human body.So the Thymallus arcticus can be confirmed as a high nutritional value,and has broad market excellent prospects of farmed fish. It should be rational development and utilization.