Dukezong Ancient City as the oldest castle on the Tea Horse Road, so with its unique geographical location, and the vicissitudes of an ancient city full of mercy, welcome the endless business travelers in the history of the Tea Horse Road. At the same time, the development of business has also cultivated a generation of giant merchants who have gone out from the ancient city of Dukezong. Ma cast materials are one of them. With the Tibetan cast materials of the "cast record" business, this is the long historical footprint of Dukezong ancient city, exploring the outside world.