Abstract: 【Objective】 To analyze nutritional composition in gonad and muscle of Eriocheir hpucnsis and investigate nutritional quality to provide scientific basis for E. hpucnsis nutritional value.【Method】30 healthy male and 30 female healthy E. hpucnsis were selected, and their body index, nutritional components, amino acid and fatty acid content in gonad and muscle were determined.【Result】The total edible yield and gonadstomic index of female E. hpucnsis were 20.16% and 244.56% higher than those of male E. hpucnsis significantly(P<0.05, the same below);no significant differences in hepatostomic index, meat yield and condition factor were found between female and male(P>0.05, the same below). The crude protein and crude fat content in gonad and muscle of female were 57.60% and 1546.30% higher than those of male significantly;and crude protein and crude fat content in muscle of female were 3.90% and 22.81% higher than those of male significantly. The content of essential amino acids(EAA), non-essential amino acids(NEAA), total amino acids(TAA), and delicious amino acids(DAA) in the gonad of female were 85.99%, 21.61%, 41.24% and 13.74% higher than those of male significantly. The EAA in the muscle of male(62.09 mg/g) was significantly higher than that of female(60.27 mg/g), showing an increase of 3.02%, and no significant differences of TAA and DAA were found. According to the amino acid score(AAS) and chemical score(CS), the first limiting amino acids for both male and female E. hpucnsis was valine, and the second was methionine+cysteine under standard of AAS;the first limiting amino acid for both male and female E. hpucnsis was methionine+cysteine, and the second was valine under standard of CS. Essential amino acid index(EAAI) of male E. hpucnsis muscle(85.12) was higher than that of female(79.13), and EAAI of female gonad(89.35) was higher than that of male(77.01). The content of saturated fatty acid(SFA) and polyunsaturated fatty acid(PUFA) in the gonad of male was higher than that of female E. hpucnsis significantly, increased by 26.25% and 11.93%, respectively, but there was no significant difference of these two indexes in muscle;and the content of monounsaturated fatty acid(MUFA) in gonad and muscle of female was significantly higher than those of male E. hpucnsis, increasing by 23.01% and 9.38%, respectively. The content of eicosapentenoic acid + docosahexoenoic acid (EPA+DHA) in male gonad and muscle(15.15% and 13.08%) was significantly higher than that in female E. hpucnsis (13.18% and 10.97%), and the ratio of ∑n-3/∑n-6 PUFA in muscle of male(1.06) was significantly higher than female E. hpucnsis(0.86).【Conclusion】 The total edible yields, protein and fat content in female E. hpucnsis muscle and gonad and the nutritional value of gonadal amino acids are better than those of male E. hpucnsis, while the nutritional value of essential fatty acid in male muscle is better than that of female. Therefore, E. hpucnsis is a large edible crab rich in highquality fatty acid and balanced amino acid.