Influences of dosage of gelatin, sodium caseinate, and glycerin, and forming temperature on film properties were investigated. The best film forming technology and notable factors influencing film properties were determined. The results showed that the best film forming technology is 5% gelatin, 8% sodium caseinate, 14% glycerol at 50 ℃, by which the tensile strength, elongation, transparency, haze values, gas permeability and water vapor permeability of the film is 11. 45 MPa,28. 67%,92. 3%,7. 56%, 10. 101 cm3 / (m2 ·d·0. 1MPa), and 1. 69×10-13 g·cm/ (Pa· s·cm2 ) respectively; Glycerol proportion is the most significant factor influencing tensile strength, elongation and water vapor permeability of gelatin-sodium caseinate films and the corresponding partial regression coefficent are -0. 901, 2. 720, and 0. 9662 respectively; both gelatin and sodium caseinate content are significant factors influencing gas permeability, which can increase of gas barrier properties.