8-inch wafers are considered to be backward in production line. However, it is this product that is “older” than 12 inch wafers for many years, and its production capacity is still very tight. Most chip companies have raised the prices of 8-inch wafers by at least 20% in 2021, and emergency orders by up to 40% due to strong demand driven by the home office trend and 5g boom, according to industry sources. < / P > < p > at present, the production capacity of global OEM is full, and the utilization rate of pure generation factories such as TSMC, Samsung, liandian, world advanced and SMIC international keeps at a high level. IDM manufacturers such as huarunwei and Shilan micro are also fully loaded with 8 inches and below. Industrial chain order spillover, looking forward to Q4 is still in short supply. < / P > < p > according to the semi report, the number of 8-inch wafer production lines in the world reached 199 in 2007, and then began to decline gradually. By 2015, there were only 178 wafer production lines. Therefore, there has been a supply shortage in relevant markets. < / P > < p > a shortage of 8-inch wafer capacity began in 2018, mainly due to the demand for CMOS image sensors and fingerprint identification chips driven by mobile phone multi camera and fingerprint. < / P > < p > by 2020, the penetration rate of 5g mobile phones, automobiles and the Internet of things will increase rapidly, which will greatly increase the demand for power, power management and power devices. In addition, the demand for home office and online education driven by the epidemic will increase, which will increase the demand for notebook, tablet and other electronic products, thus driving the growth of demand for driving IC chips, separated components and other semiconductor components. < / P > < p > according to the semi report, by the end of 2020, the number of 8-inch production lines will recover to 191, equivalent to the industry level in 2008. By the end of 2021, it will continue to grow to 202, which will exceed the record of 199 in 2007. According to forecasts beyond Moore, the expansion of 8-inch wafer demand starts in 2017 and will last at least until 2023. Spontaneous combustion at a Guangzhou Motor vehicle intersection and other traffic lights in Shenzhen