The chitosan gallates (CG) were obtained by free-radical-initiated grafting of gallic acid (GA) onto chi- tosan in work. The chemical structures of the co were corroborated by Uv-vis, GPc and 1H analysis. The reaction was accompanied with a degradation of the CS molecule The shear- grafting thinning flow behavior of cos film-forming solutions (CG FFS) decreased with the grafting amount of GA into cs chain, while the CG FFs grafted at a lower GA value behaved like a networks containing entangled onto the CS or cross-linked polymer chains with a more elastic behavior. GA inthe correspondinti chain led to a reduction of tensile strength, elongation at break and water resistance of films, but increases in the antioxidant and antimicrobial activities were observed. The microstructure the film was investigated using scanning electron and atomic force and the results were closely related to the observed film properties.