Abstract: In order to investigate the effect of different thickening agents on water solution stability of superfine comminuted milk replacer, carboxymethyl cellulose, prior to reconstitution, microcrystalline cellulose and ethyl cellulose ethoce were added into the milk replacer with the proportion of 1%, 4%, 8%, 12%, 16% and 20%, respectively, and the samples were reconstituted in warm water with temperature of 60, 70 and 80 ~C, respectively. To avoid the influence of environment temperature, the experiment was performed in the constant temperature water bath pot. After reconstitution, the emulsion separation time of milk replacer samples added with different thickening agents under varied temperatures were determined by sensory test. The results of the test were recorded by videotapes and then analyzed. Meanwhile, the homogeneity and stability of the common type and superfine comminuted milk replacer were also statistically compared. The water solution stability of the superfine comminuted milk replacer added with 8% carboxymethyl cellulose was shown to be preferred, and the treatment of superfine comminution was able to improve the color and reconstitution property of the milk replacer.