Poly (acrylic acid-co-Allyl glycidyl ether) for ceramic dispersantion was synthesized. Ammonium persulfate was used as initiator agent, and the sodium hypophosphite was a chain transfer agent for synthesis. The reaction was monitored by online infrared, and the molecular weight was measured by gel-permeation Chromatography (GPC). The effects of synthesis conditions, such as concentration of acrylic acid, ammonium persulfate, sodium hypophosphite reaction temperature and reaction time were investigated respectively. The effect of dispersant weight on Zeta potential value and suspension rhelogy behavior were measured as well. The online IR showed that polymer was poly (acrylic acid co-maleic anhydride) sodium, its optimal synthetic conditions were got as follows: w(acrylic acid) 28wt%, ammonium persulfate 0.17 g, sodium hypophosphite 2 g, allyl glycidyl ether 0.9mL, reaction temperature 80 ℃, reaction time 3.5h. The lowest Zeta potential value was -66.7mV, when dispersant weight concentration was 150mg/L, the shear stress reduced along with the increased dispersant weight.