With the sol-gel method

the regenerated SF(silk fibroin)／nano—TiO2 composite films were prepared．Comparod to the pure silk fibroin films

the mechanical strength of these regenerated SF／nano-TiO2 composite films were increased and the loss percentage of SF／nano-TiO2 composite films in aqueous solution were decreased．By using UV

AFM and SEM

these films were characterized．The experimental results reveal that the diameter of nano—TiO particles in films was about 80nm．The nano—TiO2 particles were well dispersed in the regenerated silk fibroin．It was found that the crystal structure of the composite films changed from typical Silk I to typical Silk Ⅱ.Furthermore

the crystallinity of the composite films was obviously improved．Through the TGA

it was demonstrated that the heat transition temperature of composite films was also changed．