Ferulic acid and gelatin were added into soybean protein to prepare packaging films. The effects of ferulic acid and gelatin on the mechanical performance, moisture permeability, haze and transparency of the soybean protein packaging films were studied. The results showed that when ferulic acid was added, the performance of soybean protein films increase clearly; the tensile strength, elongation and tear strength increase visibly; when ferulic acid and gelatin were added, the impact strength and tear strength increase continuously, but the tensile strength and elongation decrease; when ferulic acid and gelatin were added, the transparency of the films decreases and the haze increases.