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Wudi salt area is located in the northeast of the county, on the southwest Bank of Bohai Bay, with a coastline of 102 kilometers. The terrain is high in the southwest and low in the northeast, with a gradient of 1 / 10000. 5.17 million hectares of beach in the salt area belongs to the plain sand base type. The soil in the salt field is mainly yellowish brown sandy clay with solid chassis and low permeability. Salt area belongs to the continental climate of the North Temperate East Asian monsoon area, with distinct four seasons, obvious dry and wet conditions, sufficient sunshine, large evaporation, concentrated rainfall, and the degree of dryness and lack of rainfall ranking the first in the province. The sea water concentration layer is as high as 3.6 Baume Degrees, as low as 2.3 Baume degrees. Relying on the advantaged natural conditions of salt industry development, industrious Wudi salt people have been working on this alkali beach for generations to make salt, and constantly carrying out technological innovation and reform. During the Jiajing period of the Ming Dynasty, haifengchang was easy to boil salt for beach drying. In 1679, all the farms in the county were decocted and dried, which laid the foundation for the prosperity of salt industry. By the liberation of Wudi in 1945, the fourth special office of Bohai district established a loan Committee in Wudi, which granted a loan of 7 million yuan (Beihai dollars) to support salt production. At the same time, the county government implemented grain for salt, and the original salt was sold exclusively, eliminating the two major difficulties of salt selling and eating, and improving the life of salt people. In 1949, there were 665 salt flats in the county, with an annual output of 13000 tons of raw salt. After the founding of new China, Wudi salt industry entered a new period of planned development. In 1950, Wudi adjusted the layout of the salt area and preserved 33400 hectares of salt beach. In 1956, Wudi County's salt industry embarked on the road of cooperation. In 1957, it produced 57100 tons of raw salt. In April 1958, the original Chengkou salt field office was changed to Wudi County Salt Bureau. In that year, huiminxing administration started construction of large-scale state-owned salt farms in November. Later, due to national economic difficulties, it was postponed in 1961 and gradually formed production capacity in 1964. In 1966, the county produced 67000 tons of raw salt. In 1987, Wudi salt industry entered a period of great development. Chengkou salt field invested 16 million yuan to build the project of East crystal zone. In 1988, the old beach of the county's salt field was reconstructed, and 230000 public mu of salt field was newly built, with a production capacity of 130000 tons. In 1990, the old beach of Chengkou salt field was reconstructed with a production capacity of 800000 tons. In the same year, the construction of Lubei salt field and the second salt field began, and chewangcheng salt field was rebuilt. By the end of the 20th century, Wudi County's salt field had a production area of 3.56 million mu and a design production capacity of 2.05 million tons. In 2004, Wudi County again set off the climax of salt industry development battle, put forward the strategic slogan of "vitalizing salt industry economy and building China's sea salt (salt chemical) base", integrated and developed 5.17 million hectares of salt beach area in the county, and by the end of March 2005, the battle was successful, totaling 250000 hectares of beach area, with more than 30 million yuan of compensation funds. By 2006, the total area of salt field in the county reached By 13.89 million mu, the annual design production capacity of the county's original salt has reached 4 million tons. In the development process, Wudi County put forward the "Five Unifications" principle of salt enterprise management, which was highly valued by China Salt Corporation and China Salt Association and promoted. According to this principle, all the newly-built private salt enterprises and township salt enterprises will be incorporated into Haifeng group, and Haifeng group will implement unified management, unified planning, unified assessment, unified sales, unified realization and tax payment. The principle of "Five Unifications" provides a good policy guarantee for private capital to participate in the development of salt industry, realize the large-scale operation, and ensure that salt tax is fully and timely put into storage. Wudi salt industry is driven by the development of salt industry science and technology. From the reform of production tools in the 1950s and 1960s to the creation of "autumn irrigation and spring harvest, winter salt drying" in the 1970s, and the adoption of "dead slag pool bottom, live slag crystallization, skimming and crossing the Fu method" in the 1980s. In terms of site planning, the headquarters carried out unified planning and layout for the salt industry development in 2004 according to the principle of "three modernizations and four centralizations". At present, while carrying out "new, deep and long" technology (i.e. new brine, deep brine and proper crystallization), salt farms should increase scientific and technological input, increase plastic mulch area and strengthen plastic mulch management in a planned way, so as to further improve salt fields' ability to resist natural disasters. With the progress of science and technology, from the 1960s, the wind turbines and natural tides were gradually replaced by the power to absorb the tide and lift the water, and the artificial beach repair, salt raking, Tuo collection and loading were replaced by the electric power and mechanical power, and the animal powered vehicles were replaced by the automobiles, trains and ships to transport salt, so that the salt people were liberated from the heavy physical labor. At the same time, the physical labor productivity increased from 31.7 tons / person in 1952 to 630 tons / person in 2006; the total labor productivity increased from 830 yuan per capita in 1952 to 3100 yuan / person at present. Wudi salt area relies on rich brine resources, and began to use seawater for local salt chemical production since 1958. Due to poor technical conditions, high production costs and lack of market competitiveness, Wudi salt area has been in its infancy. In the early 1990s, Wudi salt industry began to mechanized and continuous production. At that time, there were three enterprises, Chengkou salt field, Lubei salt field and County salt field. The products were mainly bromine, with an annual production capacity of 4100 tons. After the great development of salt industry in 2004, there were 7 bromine production enterprises in the county, with an annual capacity of 7300 tons. In addition, there were more than 10 products, such as potassium chloride, magnesium chloride, sodium bromide, potassium bromide, ammonium bromide, hydrobromic acid, 2,6-dibromo-tetranitroaniline, decabromodiphenyl ether, etc. In 2006, Wudi salt enterprises produced more than 4600 tons of bromine under the condition that the weather and other natural basic conditions were not conducive to salt and salt industry production, and it is expected to reach 5800 tons in 2007. In the early 1980s, Wudi salt area began to develop marine aquaculture. In 1991, Lubei salt field and County salt field carried out "one water multi-purpose" technology research at the same time, after two years of scientific research, and achieved phased results. In July 1992, the national Spark Science and technology project - Wudi County salt farm "factory grazing and processing of Artemia high salt water area" was approved by the national science and Technology Commission, and passed the expert acceptance in 1994. At present, Wudi salt industry mariculture has become one of the three leading industries of salt industry. Its products include nearly 20 varieties of 6 series, such as fish, shrimp, clam, crab, sea cucumber and Artemia, with an annual output value of more than 50 million yuan, accounting for nearly 30% of the total output value of salt industry. With the rise of salt chemical industry and mariculture, the overall industrial structure and product structure of Wudi salt industry are becoming more reasonable, which promotes the comprehensive competitiveness of salt industry enterprises. Before liberation, the salt people lived in extreme poverty. They lived in low, damp "beach houses" and ate red sorghum buns. They did not have any mechanical tools. Their production depended entirely on physical labor. The conditions were extremely hard. After the liberation, the material and cultural living standards of the workers in the salt area continued to improve. Since 1956, the government and enterprises of salt district have successively set up 5 primary schools, 1 middle school and 3 kindergartens for children of workers. At present, all the school-age children in enterprises have been transferred to the schools run by the government, and the nine-year compulsory education has been basically popularized. In addition, two staff hospitals and five infirmaries have been built in salt District, including canteen, dormitory, staff dormitory building, club, film team, TV turntable, library, amateur sports team, etc. In 2006, the annual average income of salt enterprise employees in the county was 13000 yuan.

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