The oxygen permeability and it`s proofness of the various commercial polymer films have been investigated at the constant pressure and temperature. Oxygen proofness, the reciprocals of the oxygen permeability for the various samples, were determined by means of a coulometric oxygen permeability tester. The testing of sample films. was performed at constant temperature (23±1℃) under 1 atm, for 24 hours. The order of the relative proofness observed are as follows; oriented Nylon (O. Nylon)$gt; oriented Polyester (O. PET)$gt;nonoriented Nylon (N. Nylon)$gt;nonoriented Polyester (N.PET)$gt; rigid Polyvinyl chloride (Rigid PVC)$gt;semirigid Polyvinyl chloride (Semirigid PVC)$gt; oriented Polypropylene (O. PP)$gt;plasticized Polyvinyl chloride (P. PVC)$gt;casted Polypropylene (C. PP)$gt;low density Polyethylene (LDPE)$gt;high density Polyethylene (HDPE, Inflation)$gt;high density Polyethylene (HDPE, T-die) The oxygen proofness of the films was increased with the polarity of polymer, the film thickness and mechanical orientation and decreased with the addition of plasticizer in PVC. For the use of wrapping materials, one film with the polar property in the main chain of the polymer molecule and the others with nonpolar property in it are laminated for the protection from oxygen and moisture.