Color separators can be divided into rice color separators, grain color separators and salt color separators, among which rice color separators account for more than 80%, while grain color separators and tea color separators are new varieties developed in recent years. Compared with the foreign color sorter industry, China's color sorter industry started relatively late, but developed rapidly. From initially relying on imports to breaking foreign technology monopoly and realizing localization, and then to continuous improvement and innovation of products and technologies, China's color sorter industry has achieved leapfrog development. Two CCD cameras are used for double-sided identification in every 32 channels to accurately identify defective meters. Adopting 100% digital signal new technology is a new concept of Nanta series. The new 4mm small caliber air gun (1500 times / s) can spray accurately. With the development of science and technology, the mainstream color separators in the world have adopted advanced devices as identification systems.