Abstract: This paper offers the results of an experimental study of discrimination of surface color differences on the achromatic color series by the Chinese eye.It showed that,changes of achromatic color brightness had no significant effect on the discrimination of color differences of people.The values of color differences only varied with changes of the grade of visual evaluation.These results were consistent with those of other countries.On the basis of this research,a color tolerances of achromatic color series for the Chinese Color System was established, and also approved by the National Color Standardisation Committee.

Key words: eyes, discrimination, color differences