Abstract: Based on the response surface method， the preparation process of potato starch\|based composite films was optimized. Starch content， gelatinization temperature， stearic acid content， palmitic acid content， nano\|SiO2 content， pH value were taken as single factors， respectively， to determine their influence on the transmittance， oil permeation coefficient， tensile strength， ductility， water vapor permeability and water solubility of the produced films. On the basis of single factor experiments， the optimal process parameters were explored by response surface method. It was shown that the production parameters were optimized as follows: 314% of potato starch content， 0189% of palmitic acid， 0203% of stearic acid， 0301% of nano\|SiO2， pH value of 6， and gelatinization temperature of 90℃. Under this condition， the properties of the produced films were the best.

Key words: response surface method, composite films, films properties