The present paper deals with the ratio of flesh in whole body and analysis of the nutritive composition,energy and amino acids of muscle in Carassius auratus var.dongtingking,an endemic fish living in the edge of Dongting Lake,based on 15 individuals collected from the Beiming Lake at Hunan Lixian in Mainland China in 2002.It was showed that the ratio of flesh to body was 52.18%,the ratio of gill in whole body was only 4.03%;analysis results of the nutritive composition(%,wet)were that:the moisture of muscle was 78.14%,protein 18.63%,fat 1.51%,ash 1.22%.The content of energy was 5.09 kJ/g,E/P was 27.32 kJ/g.A total of 17 common amino acids and 9 essential amino acids for human needs can be found in muscle.The total content of amino acids was 866.12 mg/g(dry);the content of essential amino acids was 48.21%;essential amino acids gram to total nitrogen gram(E/TN)was 2.81.By nutrition evaluation for the amino acids in muscle to human needs,the content of 4 kinds delicious amino acids was 50.39%;according to the amino acids score(AAS),the first limited amino acid was Met and Cys and the second limited amino acid was Val.;on the basis of chemical score(CS),the first and second limited amino acids was the same as the ASS.The results shows that the contents and composition of amino acids in muscle of C.a.var.dongtingking differ with those in three species Crucian Carp(C.a.var.pengze,C.a.var.allogynogenetic and C.a.var.pingxing red).