The effect of freeze-thaw cycles on the functional and structural properties of myofibrillar protein from mirror carp (Cyprinus carpio var. specularis) was investigated by measuring the changes in the emulsifying properties, solubility, δ-potential, surface hydrophobicity and content of sulfydryl, free amino acids, dityrosine, surface hydrophobicity and α-helix. The results indicated that the solubility, emulsifying activity and emulsion stability of myofibrillar protein decreased to 62.85%, 20.67 m2/g and 34.83%, respectively after five freeze-thaw cycles (P © 2019, China Food Publishing Company. All right reserved.