Dispersion mechanisms of different dispersants were introduced briefly, and the aid-grinding, stable dsipersing, diluting and water reducing, and energy consumption reducing effects of the dispersant during the preparation of the ferrite were also discussed. The dispersive effect of four kins of dispersants in the ferrite slurry were investigated with a fixed content of 1% for the dispersants. The results showed that the dispersive effect of different dispersants is different. For the dispersant A with a better dispersive effect, the effect of its content on the dispersion was further investigated. The results indicated that an optinal amount of dispersant exists. Therefore, the proper dispersant and its content used for dispersing the ferrite slurry with different composition and prepared by different process should be determined by experiments.