Carboxylated poly-n-butyl acrylates were used as model polymeric dispersant. The effect ofpolymers on the dispersion of γ-Fe_2O_3 in cyclohexanone were studied through sedimentation testand rheological measurement. The polymers with strong anchoring groups at one end of the polymerchain were the most effective polymeric dispersant, which improved magnetic properties of the preparedcoatings significantly. The effect of polymers on the dispersion of γ-Fe_2O_3 in cyclohexanone were studied through sedimentation test and rheological measurement. The polymers with strong anchoring groups at one end of the polymer chain in the most effective polymeric dispersant, which improved magnetic properties of the preparedcoatings significantly.