In the muscle of yellowtail fish, the mass fraction of each component in the fish muscle is crude protein 21.10, crude fat 1.31, crude ash 1.50, and moisture 74.40. The total amount of hydrolyzed amino acids in dry matter is w76.38, of which essential amino acids w32.46, accounting for 42.5 of the total amino acids; flavor amino acids w32.51, accounting for 42.56 of the total amino acids. Methionine is the first limiting amino acid, and lysine content (per gram of nitrogen) is the highest, reaching 494mg*g-1. Taurine content is 3040mg/kg. Yellowtail fish is a delicious and excellent food with high protein and low fat. Because it is rich in crude protein, methionine and other nutrients, its fish tastes fresh and smooth, and it has the functions of improving human immunity, protecting eyesight, improving memory, strengthening the spleen and stomach, etc.