Abstract: In this research, an experiment was carried out to investigate therelationship between the target colours with various sizes or luminanceson a CRT display and the performance of people's colour-identificationon the CRT display. The effects of absolute colour-identification on co-lour coding in the CRT display were examined. The purpose was to de-termine how to improve the ergonomics of visual performance of colourcoding in CRT displays. The results showed that the performance of thecolour-identification was significantly affected by the target size and lu-minance, and that the number of the colours and range of selected colo-urs for the colour coding could be expanded with the expansion of thetarget size and the increase of the target luminance. Three to six colou-rs can be chosen to make up the colour coding systems with the varioustarget sizes.

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