Search engine Google is in talks with Chinese officials after the country's government blocked access to the site.
The government blocked the search tool as part of a crackdown on access to political sites ahead of a meeting to discuss consitutional reform.
Google said in a statement that it is working to get the service restored for its "millions of Chinese users".
The website is popular with the Chinese because its search engine can use Chinese characters.
It is thought that the government may have blocked access to tighten media controls ahead of a major political assembly expected to bring sweeping changes to the membership of the government.
It is also thought that the Chinese authorities did not want these proposals debated on the internet first.
A Chinese foreign ministry spokesman defended the government's decision to limit civilian access to the internet.
He told the BBC: "Obviously there is some harmful information on the internet. Not everyone should have access to this. The whole world now is exploring a way to manage the internet and China is also working on this."
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