A color sorter machine is frequently used to remove foreign materials such as colored, broken, immature and insected grains from raw grain materials that chaff and bran were peeled from paddy, which was introduced with according to customer's demand for high quality grains. Our machine is equipped with cooling system for longer service life and higher stability. Reliable mechanical structure design, simple and effective electrical and optical system, and optimized system structure greatly improve the reliability of the machine.