The man fell ill on January 15 in Guizhou province, and tested positive for the H5N1 virus on Sunday, the Xinhua news agency said.
Authorities are monitoring others who came in contact with the man, but no one else has been found ill, Xinhua said.
In recent days, China’s health ministry has moved to allay fears over a bird flu outbreak. The ministry said that although further human bird flu cases were possible throughout China, there wouldn’t be a large-scale outbreak, Xinhua and CCTV said.
The country also announced it was setting up a nationwide network to test for the virus.