Heavy industry refers to the industry that provides the material and technical basis of the main means of production for all sectors of the national economy. According to its production nature and product use, it can be divided into the following three categories: (1) mining (logging) refers to the exploitation of natural resources, including oil mining, coal mining, metal mining, non-metal mining and wood logging; (2) Raw material industry refers to the industry that provides basic materials, power and fuel for all sectors of the national economy. Including metal smelting and processing, coking and coke, chemistry, chemical raw materials, cement, wood-based panels, electricity, petroleum and coal processing industries; (3) Processing industry refers to the industry that reprocesses industrial raw materials. Including machinery and equipment manufacturing, metal structures, cement products and other industries that equip various sectors of the national economy, as well as industries that provide agricultural production materials such as fertilizers and pesticides.