Abstract:This paper was studied on color-protecting of cress. Through the Plackett-Burman experiment design and the path of steepest ascent experiment design about color-protecting of cress，the most important factors were screened out，such as the compound reagents of colour fixative，the concentration of colour fixative and the blanching time. Using Design-Expert 8.0，the optimum color-protecting technological conditions were that the D-Sodium isoascorbiate and sodium bicarbonate mixing ratio was 5:2.62，the concentration of colour fixative was 0.36 % and the blanching time was 1.40 min. In these conditions，the effect of color-protecting was the best.