Of those who took part, 99 per cent said they felt working conditions did not meet international standards.
"The FCCC is troubled by the breakneck speed by which media freedom is declining in China," it said in a statement on Monday.
In the run-up to the Beijing Winter Olympics, which begin on Friday, 60 per cent of the 127 respondents criticised the insufficient information provided by the organisers about events.
Almost a third of respondents complained of being excluded from events that would have been open to other media.
Almost half of respondents said that their offices were understaffed as they were unable to bring journalists into the country.
Visa denials, surveillance, intimidation and harassment were reported in daily work. "As a result, reporting from China is suffering," the FCCC statement said.
China correspondents unable to report directly from the country have taken up residence in Taipei, Singapore, Sydney, Seoul or even London, it said.
Meanwhile, those able to work in the country routinely suffer significant restrictions on their work, the report says, with 62 per cent saying they had been prevented from reporting at least once by police or other officials.
Of those who had visited Xinjiang, the region of northwest China where persecution of the Muslim Uighurs has been the subject of international condemnation, 88 per cent reported being harassed.
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