Based on the single factor experiments,effects of alginate complex coating on white blush of fresh-cut carrot were studied by using fresh-cut carrot as material.The mathematic model were built by Central Composite Design in Design Expert software.The result showed that the regression equation fit well,the optimal complex coating compositions for controlling the white blush were: alginate 10.28 g/L,gelatin 4.98 g/L,sodium stearate 2.55 g/L.Under these conditions,white index of fresh-cut carrot was 30.64.The mathematic model can better predict the white index of fresh-cut carrot.