First, environmental risks, and the state has become more and more strict in environmental control. Since 20 17, the environmental protection of major stone production bases in China has been rectified, and once the environmental protection inspection fails, it will fall short; Second, the price fluctuates greatly, just like speculating in futures. Pay and income depend on luck. Third, it takes a long time and is risky. A certain stone variety was stable when the sample was sent to Party A, but when Party A decided to stop mining the product, the price of the product went up. Other substitutes have also increased in price, and the profit of the project that has been painstakingly entrusted to find someone to repair is gone; Fourth, the capital and labor costs are high. Many engineering enterprises have an experience that a small project cannot be started without tens of millions of upfront funds. Fifth, it is difficult to settle the payment for goods, and the stone industry projects are big, with long settlement period and high risk of default.