With chitosan and polyvinyl alcohol (PVA) as the components, a new type of environmental-friendly packaging material with excellent properties was prepared. This blend film of chitosan/PVA was prepared by solution mixing. The structure was studied by infrared spectroscope and scanning electron microscopy. And the mechanical properties, gas permeability, optical transmittance and haze of the films were tested. The results showed that there was some strong interaction between the two components. When the blend ratio of the two components was 60∶40 or 40∶60 (volume ratio), the membrane surface of the prepared blend film was smooth and the compatibility was very good. The prepared blend films of chitosan/PVA had great film-forming property, mechanical property and gas permeability, which can be widely applied in the fields of food, medicine and so on.