what is the best way to travel from Kunming to Lanxia City in in Northen China?

Would you confirm the Lanxia city? At least, you can tell me which province it is in, because I don't find that.

oh im sorry..Its Linxia actually, not Lanxia
its located in Gansu Province and also known as Little Mecca in China

It is suggested to fly to reach Lanzhou airport first. Then take the airport shuttle bus to reach its terminal at the Civil Aviation Ticket Office and then change to take a taxi to reach Lanzhou South Bus Station. From LZ South Bus Station, you can find the direct buses to reach Linxia.