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Effects of power ultrasound with 251d-Iz,different electric power on the supercooling degree of solution with dissoluble compounds in wheat flour are studied by the self-designed ultrasound-assisted freezing cycle system.The results show that the power ultrasound can reduce remarkably the supercooling degree and accelerate the nuclear formation of ice.The higher the electric power of ultrasound is,the lower the supercooling degree is.The research redounds to uncover the mechanism of ice crystallization in the solution that dissolves many kinds of inorganic and organic compounds during the food freezing process assisted by ultrasound.