Since 2012, my country's economic growth has slowed down. The downstream industries of heavy machinery such as steel, coal, and non-ferrous metals have continued to slump, and their production capacity has been in excess. This has led to a decline in the growth rate of its fixed asset investment and weakened demand for heavy machinery. Although product prices in steel, coal, mining and other industries have rebounded since 2016, the fixed asset investment in most downstream industries is still in a state of decline. From the data point of view, the growth rate of fixed asset investment in key downstream industries of heavy machinery has declined significantly since 2012; from 2015 to 2016, except for metal mining and dressing, investment in other major downstream industries has experienced a significant year-on-year decline. Including mining industry, coal mining and washing industry, non-ferrous metal mining and dressing industry, ferrous metal mining and dressing industry, non-ferrous metal smelting and rolling processing industry, ferrous metal smelting and rolling processing industry; January to July 2017, except coal In addition to the small increase of 1.60% in the investment completion of the mining and washing industry, the investment completion of the other six sub-sectors continued to decrease year-on-year, which provided weak support for the development of the heavy machinery industry. In addition, the 2017 government work report has made it clear that we will continue to promote the reduction of capacity, reduce the steel production capacity by about 50 million tons, withdraw more than 150 million tons of coal production capacity, and eliminate, stop and delay the construction of coal power capacity by 50 million tons. Above kilowatts.