The ministry posted a list of 100 songs that had to be purged from the Chinese sites because they had never been submitted for mandatory government screening. The songs include Lady Gaga's "Judas" and Perry's "Last Friday Night."
The ministry said the rule was meant to preserve China's "national cultural security."
Sites were told in the Aug. 19 announcement that they had until Sept. 15 to delete the songs. It said violators would be punished, but didn't outline the penalties they would face.
China strictly controls the Internet and arts.