Abstract: Objective:To study the effects of ultrasound power:0, 100, 200, 300, 400 and 500 W on physicochemical property and texture property in myofibrillar protein (MP) gel were examined. Methods:MP was extracted from breast muscle, and the MP solution in different ultrasonic power (UP) and then heat induced gel were prepared. Results:As UP increased, UP treatment significantly caused a decrease in MP particle size from 1914.67 (0 W) to 624.50 (500 W) (p<0.05), but an increase in the solubility of MP solutions from 8.15% (0 W) to 15.50% (500 W) (p<0.05). Besides, the absolute value of the zeta potential of MP gradually increased from 5.36 (0 W) to 7.40 (500 W), surface hydrophobicity of the MP slowly changed from 398.63 to 526.11 (0~200 W), then further increased to 772.29 (500 W). While MP gel hardness rapidly increased from 30.10 g (0 W) to 51.40 g (200 W), and then slowly decreased to 49.40 g (500 W). Meanwhile 200 W was the optimum PUS power to obtain better MP rheological properties (G' and G″) and microstructure of MP gel. Correlation analysis showed that UP was related to physicochemical property of MP (particle size, solubility, Zeta potential absolute value and the surface hydrophobicity) (p<0.05). Conclusions:Ultrasound had significant impact on both physicochemical property of MP, and had slight effect on texture property.