In this study, we discussed the relationship between the dispersive mixing of fine particle aggregations and shear flow by using the Carbon Black (CB) which is one of typical fine particle aggregate. The silicone oils which have several viscosities were used as the test fluid. The CB with the aggregate diameter of 850 – 1000 micrometer was used. The CB content was set up at 0.3 wt%. And the special equipment that can create the shear flow by using Couette device was used in the experiment. The dispersion state of CB was evaluated by using image analysis after mixing. The results obtained were following, 1) The number of small size CB increased with mixing time and the color of CB/silicone mixture changed black after long mixing time. However, the large size CB would be difficult to break even if the mixing time was long. 2) The weight average of CB aggregate diameter decreased with an increase of shear stress although the relationship between the weight average of CB aggregate diameter and shear rate could not be clearly.