Rice with color selector from the detection structure can be divided into two kinds of one-way and two-way, from the process can be divided into two types of selection and with a two check. The old color sorter using one-way detection, it only from one direction of the material were observed for particles or material with lesion on the back of the occluded in the overlap of particles cannot be detected by leakage. Thus, in principle, it is not perfect. Because this form of color sorter corresponding to each track only a sensor used, it was observed that the total light signal of the whole slide range, and can not be separated and a slideway shed a few grain of rice or barley grains of each color. Rice color sorter is a kind of effective separation equipment for quality detection and classification of granular material, is widely used in food, chemical industry, paint. In the current domestic market, foreign brands of photoelectric color selection machine occupies a major share, in recent years, the domestic independent research and development of photoelectric color selector also began to gradually get the application. Photoelectric color sorting machine as a typical electromechanical integration system.