Abstract: Based on photometerical measurement and psychopysial method, this researchaimed to study the process of human vision system’s cognitive peration in keepingcolor constancy. In experiment 1, the color contrast’s influence on the cognitive pro-cess in keeping color constancy was investigated, the results suggested that human vi-sion system can make use of the adapted color contrast to correct or compenste forthe changed color which is caused by the environmental illumination. In experiment2, human visual experience’s influence on the cognitive process in keeping color con-stancy was investigated, the results suggested that color constancy concerned nor onlywith low level automatic visual process, but also high level consious cognitiv pro-cess.

Key words: color constancy, cognitive operation, correction & compensation