Abstract: The composition ratio and technological process of preparing chitosan film were explored to ensure the physical properties of finished film meet the standards. Chitosan films with better physical properties were prepared by 2% acetic acid, 0.5% glycerin and 40℃. The reducing and bacteriostatic properties of tea polyphenols were determined by the concentration of tea polyphenols,but chitosan and citric acid did not affect the properties. The finished product designed in this subject has better physical properties and bacteriostasis, as well as degradability, no antigenicity, accessibility, etc., which has a certain significance for the preparation of environmental protection and bacteriostasis plastic wrap.