The flexible light source of the coarse grain color sorter is equipped with a LED lighting system with heat dissipation, which has long service life, low energy consumption and good performance. Different raw materials need different spectral lighting, and light sources can be customized according to customer needs. The simple design of the optical system, the accurate automatic calibration system, and the carefully designed human-machine interface greatly simplify the complexity of machine debugging and use, ensure simple operation, and make the machine easy to learn and use. Some Chinese enterprises assimilate foreign new technologies and independently develop high-end color sorters with new performance based on ccd sensors. Suppliers of coarse grain color sorters have a high starting point and are developing rapidly. Their performance can be comparable to that of imported products, but the price is not high. Many enterprises can afford it economically and are welcomed by most enterprises. In order to meet the challenge of imported flour, the flour industry urgently needs to improve the product grade.