Abstract: The properties of starch were improved by adding SiO₂nanoparticles,and the mechanism of improving the wearing resistance of this SiO₂ starch film was studied through experimental analysis.The effect of the content of SiO₂ nanoparticles on the wearing property of the starch film was measured using a wear tester.Then,the surface morphology of the starch film was characterized by scanning electronic microscope(SEM),atom force microscope(AFM) and high magnification optical microscope,and the wearing mechanism was analyzed.The results showed that the wear resistance of the starch film filled with optimal content of nano-SiO₂ is better than that of pure starch film,and the best wear resistance was achieved when the content of SiO₂ nanoparticles was 3%.