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To improve water-resistance and physical properties of sodium alginate film, effects of sodium alginate andplasticizer concentrations, divalent cation types and concentrations, and immersion time of films into divalent cation solutionson sodium alginate films were evaluated, based on elongation strength (ES), elongation rate (E), water vapor permeability(WVP), and water solubility (WS). Film made from 1.5% sodium alginate solution (w/w) had low WVP and WS, which areoptimal characteristics for application of film preparation. Addition of plasticizer increased E and WS. Less than 2% CaCl2addition and 15min immersion time reduced WVP, WS, and E significantly (p<0.05). Sodium alginate films treated withCuCl2, and ZnCl2 solutions had lower WVP and WS, whereas MgCl2 had no influence on improving water resistance of films.