"Laizhou big grain salt" has been officially registered as a geographical indication certification trademark by the Trademark Office of the State Administration for Industry and commerce. The original salt produced in the Tushan salt area of Laizhou has the characteristics of big square grain, uniform grain, hexahedron, smooth crystal surface, hard texture, dense structure, crystal clear and bright. It is known as "Laizhou big grain salt", which is popular in 29 provinces, cities and autonomous regions in the country. At the same time, it also produces Countries and regions such as Japan, South Korea and Taiwan are salt chemical production bases in China.