Industrial concentration refers to the proportion of output or output value of the top enterprises in an industry, reflecting the degree of monopoly in the industry market. The industrial concentration is mainly affected by the size and number of enterprises in the industry. Industrial concentration can be measured by concentration index (such as CrN, HHI), Lorentz curve and Gini coefficient. Where CrN = top n enterprise output / total industry output * 100. The larger the CRN value is, the higher the level of industrial concentration is, the closer the industrial market is to the monopoly market. Due to incomplete data collection on industrial concentration, only 2015-2019 data are available, and the calculation results are shown in the table below