Daishan is the largest salt-producing county in Zhejiang. Since the Southern Song Dynasty, it has always been rich in fishing salt. Up to now, there are more than 35, mu of salt fields in Daishan. The scale of salt fields is the largest in Daixi Salt Field and Shuangfeng Salt Field. At first glance, there are a large number of gray salt fields, and the source of sight is the connection between the sea and the sky. Look at the glistening salt in every dark salt field nearby. Piles of salt piles like snow crystals are piled up at random, and the salt crystals shine silver in the sun. This reality has formed a unique landscape for Penglai Fairy Island. Gaoting Town Salt Field is one of the key salt fields in Daishan County, with excellent salt quality and high first-class product rate. The average sodium chloride content is 91.24%, the average whiteness is 58.57%, and the average particle size is 91.41%. It has the characteristics of fine white particles, fine taste and instant solubility, and is known throughout the country as Dai salt. It has been listed as tribute salt since the Song Dynasty.