Daocheng, ancient name "Dao Dam". The Tibetan meaning is "the place where the valley opening is open". It was the land of Bai Lang Qiang in Eastern Han Dynasty, belonged to Tubo in Tang Dynasty, belonged to the Propaganda Office of Tubo and other roads in Yuan Dynasty, belonged to Duoghan Dusi in Ming Dynasty, and belonged to Litan Chieftain under Qing Dynasty.