Industry takes light industry as the forerunner and gradually turns to the development process centered on heavy industry and chemical industry, that is, the so-called heavy, chemical industrialization process  At present, in developed countries, the ratio of heavy industry and chemical industry in the whole industry is generally between 60% and 65%
At present, the process of industrial development shows the trend of transformation from light industry to heavy industry and chemical industry
 Although the per capita national income varies greatly from country to country, the ratio of heavy industry and chemical industry is generally the same