Abstract: Potato starch-based composite films were obtained by casting using potato starch, pullulan, gelatin as film-forming material, glycerol as plasticizer, ferulic acid as cross-linking agent.The effect of the contents of ferulic acid on physical and mechanical properties of composite films were investigated.The results showed that ferulic acid improved the mechanical properties and moisture barrier properties of the composite films, reduced the water-solubility of the composite films.However, it reduced the light transmission rate of the composite films significantly, and made the color of the composite films yellow.The properties of composite films containing 1% ferulic acid were better, the tensile strength was 14.33MPa, elongation at break was 9.36%, water vapor permeability was 4.52g·mm·m～ (-2) ·d～ (-1) ·kPa～ (-1) , water-solubility was 28.46%, light transmission rate was 77.37%.