This work aims to determine the corona characteristics and printing characteristics of SiOx barrier material and study the law of corona treatment and the ability of color reproduction in printing. Composite barrier materials with different content of SiOx were prepared on the surface of PET by magnetron co sputtering method and then were treated by corona discharge. The change in surface conditions was characterized by contact angle. Then printing test was conducted on the surface of treated composite film by color ink-jet printing. The test results showed that anti corona characteristics did not exist when SiOx content was small, but it did when SiOx content reached about 50%. In conclusion, the composite film has good color reproduction after corona treatment, thus can be directly used for printing.