In the Ming and Qing Dynasties, the salt class was first placed in the Yuan Dynasty when it was promoted as the chief official of the department.It was made in the Qing Dynasty, and a salt division was set up in the three wells of gypsum, black salt and white salt in Yunnan, and each of them was promoted by a lifting departmentsubdeacon 。In charge of salt well administration, directly supervise the production and marketing of salt wells.[1]
