This law is to reorganize all products of an enterprise from the perspective of sales growth rate and market share. On the coordinate diagram, the vertical axis represents the growth rate of enterprise sales, and the horizontal axis represents the market share. With 10% and 20% as the middle points, the coordinate diagram is divided into four quadrants, namely "question mark (? ), "star (★)", "cash cow (￥)" and "thin dog (×)". In use, enterprises can divide their products into different quadrants according to their respective sales growth rate and market share, so that the existing product portfolio of enterprises can be seen at a glance and it is convenient to make different development decisions for products in different quadrants. Its purpose is to make enterprises make different decisions through the division of different quadrants where products are located, so as to ensure the continuous elimination of products with no development prospects, maintain a reasonable combination of "question mark", "star" and "cash cow" products, and realize a virtuous circle of product and resource distribution structure.