Labour MP Raymond Huo has received a telling off from his leader Phil Goff, over comments he posted on the party's blog site.
Mr Huo questioned a protest by Green Party co-leader Russel Norman during the recent visit by the Chinese Vice President Xi Jinping.
Mr Huo wrote while the Dalai Lama's followers see him as a saint, others see him as a leader who supported a system of slavery in Tibet, which the Chinese authorities put an end to in the 1950s.
Mr Goff says he told Mr Huo his blog postings should be in line with party policy.
Labour supports a one-China policy, but says it encourages the Chinese government to maximise the spiritual and cultural identity of the Tibetan people.