Abstract: With calcium lignosulfonate and PVA as the primary materials，the composite film of good mechanical properties and low water absorption was prepared. By adopting 5 factors quadratic orthogonal and rotational combination design，the effects of calcium lignosulfonate，PVA，formaldehyde，urea and borax on tensile strength，elongation at break and water-absorption rate were studied and relevant quadratic regression models were developed. The model analyses showed that all single，quadratic and mutual terms of the five factors affect the composite film properties to some extent. The results showed that the optimal condition for the composite film with good performance are follows: calcium lignosulfonate content 7 g，PVA content 14 g，formaldehyde content 10 g，urea content 7 g，borax content 2.5 g.