Abstract: The ultrasonic water-heat method aided with pure dispersant can obtain ultrafine and pure attapulgite. Effect of six pure dispersant on the production was explored, the experiment show sodium hexametaphosphate is the best pure dispersant for preparing ultrafinne and pure attapulgite. The attapulgite treated by ultrasonic water-heat method assisted with sodium hexametaphosphate is able to achieve whiteness 87, granularity d₉₀ below 4.7μm, next to no impurity showed by X-ray powder diffraction (XRD) analysis.