Abstract: Objective: To study and discuss the essential chemical composition and physicochemical properties of Pseudosciaena crocea viscera peptide. Methods: The content of protein, fat, moisture and ash in Pseudosciaena crocea viscera peptide powder were measured.The physicochemical properties of different peptides concentration ( 2%, 5%, 10%) , were evaluated under different p H conditions.Besides, viscosity and inhibition of lipid peroxidation in emulsion were also discussed with different peptides concentration. Results: The results indicated that Pseudosciaena crocea viscera peptide contained 88.42% of protein and the p I was about p H6, at which emulsibility and foam stability reached the lowest and then had a rapid improvement. However, emulsion stability, foamability were increased firstly with the increasing of p H and then decreased, which met the bottom at p H6.The increase of peptide concentration possessed higher viscosity, emulsion stability and foam stability. On the contrary, the solubility, emulsibility got significant reduction while peptide concentration increased.In addition, foam stability did not have a significant changed as peptide concentration increased.Moreover, Compared with traditional emulsifier Tween 20, 10% Pseudosciaena crocea viscera peptide were not only decreased MDA in emulsifier about 84.5%after 150 min, but also showed inhibition of flocculation. Conclusion: Pseudosciaena crocea viscera peptide exhibited diverse physicochemical properties under different p H or concentration conditions, and could be used as potential additives for food applications