China's Foreign Minister Wang Yi said the United Nations High Commissioner for Human Rights, Michelle Bachelet, could visit Xinjiang, but made clear that China did not agree to any investigation based on the presumption of guilt.
Bachelet has long sought to visit the region in western China to investigate allegations of abuse against the ethnic Uighurs.
The issue has soured relations between Beijing and the West, prompting Washington to accuse China of genocide, as well as a US-led diplomatic boycott of the Beijing Winter Olympics.
In response to a question whether Bachelet will be allowed to visit Xinjiang without any restrictions, the Chinese foreign minister said Saturday before the Munich Security Conference via video link that "China rejects all forms of bias, prejudice and unjustified accusations."
Rights groups accuse China of committing widespread abuses against Uighurs and other minorities through torture, forced labor and holding a million people in concentration camps.
China says the camps are re-education and training facilities, and denies any mistreatment, saying it is fighting religious extremism.