Chinese President Hu Jintao on Monday launched a campaign to rid the country's sprawling Internet of "unhealthy" content, state television reported.

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"Development and administration of Internet culture must stick to the direction of socialist advanced culture, adhere to correct propaganda guidance," said a summary of the meeting read on the news broadcast.

"Internet cultural units must conscientiously take on the responsibility of encouraging development of a system of core socialist values."

In January, President Hu made a similar call to "purify" it, and there have been many such calls before.

"Consolidate the guiding status of Marxism in the ideological sphere," the party meeting urged, calling for more Marxist education on the Internet.

In 2006, China's Internet users grew by 26 million, or 23.4 percent, year on year, to reach 137 million, Chinese authorities have estimated.

That lucrative market has attracted big investors such as Google and Yahoo.

Authorities have also launched repeated crackdowns on pornography and salacious content. The latest campaign against porn and "rumor-spreading" was announced earlier this month.

The meeting also announced that schools and sports groups would be encouraged to use healthy competition as a way to shape youth, the report said.

"Sports plays an irreplaceable role in the formation of young people's thinking and character, mental development and aesthetic formation," the meeting declared.