The color separation accuracy and the belt out ratio of the big rice color separator are important indicators to measure the quality of the color separator. Generally, the color separation accuracy should be greater than 1, and the belt out ratio should be less than 1:8. From the perspective of operation, the selection of touch-screen intelligent operating system can reduce the operator's learning and mastery of computer language. From the perspective of after-sales service, it is a better plan to choose products of domestic enterprises with better qualifications. At present, the quality of color separators produced by domestic enterprises is comparable to that of foreign brands, and there are convenient advantages of after-sales service and professional maintenance centers.