"Some female live-stream hosts wore revealing clothing, while some male hosts used vulgar words and actions, performed vulgar hot dances, spoofs, called names and other phenomena despite repeated prohibition," the authority said.
The CAC, which recently inspected 31 platforms, said it also found some used "pornographic" content to attract users and were suspected of organising illegal gambling, "seriously deviating from the core values of socialism".
The 10 platforms are required to "rectify" their content and add the most egregious live-streaming offenders to a cross-platform blacklist.
Chinese authorities, used to controlling social and traditional media through censorship, have scrambled in recent years to maintain order in the fast-growing live-streaming sector and limit sensitive or politically undesirable content.
Last year, LGBT discussion groups and search terms were removed from Bilibili as part of a larger censorship of China's LGBT community.
In June, police in the central city of Zhengzhou arrested a married couple for allegedly posing as a ride-hailing driver and passenger in a live-streamed porn video that also prompted a defamation lawsuit from taxi app Didi Chuxing.
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