我国有长达18000公里的海岸线,海水资源十分丰富。自古以来,沿海地区以海水为原料晒盐,称为“海滩制盐”。另一方面,据《史记·夏本纪》称,早自三千年前起,渤海莱州湾沿岸(古青州地),有“海滨广泻,厥田斥卤”、。厥贡盐缔”的记载。人们于斥卤之地,掘坑取水, Our country has a coastline of up to 18,000 kilometers and the seawater resources are very rich. Since ancient times, coastal areas using seawater as raw material sun salt, known as the “beach salt.” On the other hand, according to “Shi Ji Xia Ben Ji”, as early as three thousand years ago, the Bohai Sea coast of Laizhou Bay (ancient Qingzhou Prefecture) has “waterfront, Juetian repellent.” Jigong salt Association. "People in the halogen territory, digging pit water,