Three kinds of materials such as KNY/CPP, OPP/VMCPP and PET(SiO-2)/CPP were used for packing cake. The influence of oxygen permeability of the packaging materials on grease oxidation degree of cake was studied and the oxidation rate under packaging status was characterized. The fitting equations of acid value and oxidation rate of these materials were obtained. The result showed that a clear mathematical relationship between oxygen transmission rate of materials and grease oxidation rate of cake cannot be established.