"Lewd and pornographic content seriously pollutes the online environment, depraves social morals and poisons the physical and psychological health of the masses of young people," the statement said. "It must be firmly controlled."
The ministry said nearly 9,000 pornographic Web sites have been deleted from the Internet and 5,394 suspects captured in 2009, although it did not say how many of them were formally arrested or charged.
It said future efforts would focus on China-based operators of overseas-registered Web sites and companies that provide Internet services, or register domain names or rent virtual space to sites with pornographic content. The ministry also offered rewards to members of the public who provide useful information in policing efforts.
The communist government says the main targets of its Web censorship are pornography, gambling and other sites deemed harmful to society. Critics, however, say that often acts as cover for detecting and blocking sensitive political content. Its restrictions of the Internet are often referred to as the "Great Firewall of China."
Many foreign sites have been blocked by China's Internet authorities, including YouTube, Facebook, Twitter and a host of other media and news Web sites.
Last year, China backed down from a requirement for new computers to be loaded with a controversial Internet-filtering software known as Green Dam Youth escort after a major outcry from Chinese citizens and computer companies. That software had been introduced as a filter against porn.