Introduction to the Shihai Salt Track Exhibition Hall: The Shihai Salt Track Exhibition Hall shows visitors the development of the salt industry in Chinese history: salt is an important strategic material related to the national economy and people's livelihood. In ancient Chinese society, "salt is a gift to the world, and salt benefits half of it." Since the implementation of the "official mountain and sea" policy in Qi during the Spring and Autumn Period, salt interests have become a fatal temptation in the eyes of rulers of all dynasties. Its production and circulation have been monopolized by officials, and monopoly and even military control have been implemented. The purpose is to obtain high taxes and For the purpose of preparing the military and the country, the development history of Haiyan has actually gone beyond the simple history of technology, and has been integrated into the national management system and taxation system.