The long-term stability of the color sorter is very important. The stability of the performance of the six color sorter directly affects the production and benefit of users. Many color separators have just been debugged and the effect is OK. After a period of use, the performance drops significantly, or even has little effect. They need regular maintenance and re commissioning. This is mostly due to the low stability of the optical system composed of the light source, background and imaging system of the color sorter, especially on the equipment with simple optical system. In the application environment of the color separator, there are a lot of dust and dust, as well as vibration and interference. Temperature changes and differences in rice and wheat quality will affect the working state of the color separator, resulting in inaccurate detection signals or changes in the delay time for controlling the opening of the high-pressure air valve, thus affecting the accuracy of impurity injection action. To improve the stability of the equipment, in addition to using highly stable light sources and high-quality imaging lenses, corresponding control technologies should be used to compensate for the impact of environmental changes on the color sorter, and automatically adapt to different food sources and impurities, so that the color sorter can always be kept in the best working state. To sum up, when selecting the color separator, we should focus on the progressiveness of the technical performance, the reliability of the equipment quality and the long-term stability of the use of the color separator, and conduct comprehensive consultation and extensive comparison. Because the color sorter is a high-tech product and its price is much higher than that of ordinary grain processing equipment, we should be cautious when selecting the color sorter, so that we can have a basic understanding of the products of different manufacturers, select satisfactory products, and let it play its due investment benefits.