Abstract: A new strippable film was developed to protect idle optical instruments from mildew,fogging and oil contamination. The new strippable protection film was made of polyvinyl chloride polymer(PVC) with antioxidant, inhibitor and other agents as ingredients. The performance of the coating was analyzed. The film-forming time was about 20min, the average mechanic strength was up to 4.52MPa. The film could be stripped easily. The environmental test results for antimildew and antifogging were very satisfactory, which proved the good performance of the protection film.