The surface of non-polar food packaging film of polyethylene (PE) and polypropylene (PP) was treated by pulsed corona. The influence of four factors of the pulse corona treatment on air permeability of the film was studied, which were the discharge power, the distance between thin film and electrode, film moving speed, and the guide roll temperature. The relation between film surface tension and film air permeability after corona treatment was discussed. The influencing rule of corona treatment on film air permeability was established. The results showed that corona treatment has significant influence on surface tension and air permeability of the film. The purpose was to provide reference for establishing mathematical model between corona treatment and air permeability of film, and reliable numerical calculation of film air permeability for modified atmosphere packaging design.