The growth rate of main business income can be used to measure the product life cycle of a company and judge its development stage. Generally speaking, if the growth rate of main business income exceeds 10%, it means that the company's products are in the growth stage and will continue to maintain a good growth momentum, and it has not yet faced the risk of product upgrading, and it belongs to a growth company. If the income growth rate of the main business is between 5%- 10%, it means that the company's products have entered a stable period and are about to enter a recession, so it is necessary to start developing new products. If the ratio is less than 5%, it means that the company's products have entered a recession, it is difficult to maintain market share, and the profit of its main business has begun to decline. If new products are not developed, they will enter decline.