Biao Zhang hasn't been seen for over a month.

The last confirmed sighting of 29-year-old Chinese tourist Biao Zhang was at a Grey Lynn motel, when he grabbed his luggage and left the group he was touring with.

More than a month later, he's still missing.

Zhang had entered the country on a tourist visa and had only been in New Zealand for five days when he decided to leave his tour group Senior Constable Graeme Bruges said.

"He has no known family or contacts in New Zealand and can only speak limited English."

Zhang was reported missing to police and Immigration New Zealand by the operator of his tour group on June 21 the day after he was last seen according to a Tourism New Zealand spokesperson.

READ MORE

* Police call for help to find tourist

Due to an arrangement, called the Approved Destination Status, between the Chinese government and New Zealand, Tourism New Zealand can promote New Zealand as a holiday destination in China.

All tour guides and tour operators have to receive ADS approval from the China Market Development Unit before they can run tours to New Zealand.

Although Zhang left the motel with his luggage, Bruges said police have concerns for his safety and well-being.

"Police are keen to speak to anyone who might have seen him or anyone who can help us to locate him."

Anyone with information can contact Senior Constable Graeme Bruges from Avondale Police on (09) 302 6400, or provide information anonymously to Crimestoppers on 0800 555 111.