Ancient city
   Huangyuan the key of the central land, the center of the market, the firstmarket in Tibet highland, opening the ancient road of the tang and Tibet. In song dynasty, it isthe key point of the silk road. In Qing dynasty, it moves to the riyue mountain and dan ger. During the time, it is prosperous and the culture pervade. It is famous fro the xiaobeijing.
   Riyue mountain is the earliest place for the market. In 734 AD, it is the market for the horse in chilling.
   Qing dynasty in yongzheng 2nd year, in tang and Tibet marks it in the border of the chilling.
   The market changed from riyue mountain to the dan ger.