PURPOSE: To prepare a frozen food having improved quality by freeze- denaturation by heating a food dough containing cereal flour, starch, water and other raw materials and slowly freezing the obtained edible material in such a manner as to decrease the material temperature at a specific average cooling rate in the zone to form the largest ice crystal in the food.

CONSTITUTION: A food dough prepared by kneading cereal, starch, water and other raw materials is poured on a copper plate heated at 180°C, baked for 2min, turned over and baked for 1 min to obtain a baked edible food. The food is allowed to cool to normal temperature, wrapped with a plastic film and placed in an atmosphere of -5°C for 72hr to cool the food at an average cooling rate of 0.01-0.2°C/H in the zone for forming the largest ice crystal in the food. The food is then transferred to a freezing chamber of -30°C, and slowly frozen to a material temperature of ≤-18°C to slowly freeze the food at a temperature in the largest ice crystal forming zone for 1-20 days to obtain the objective frozen food having improved quality.