Abstract: The effects of dispersant TERSPERSE4896、TERSPERSE2210 and thickening agent xanthan gum(XG) to the rheological property of 50% carbendazim suspension for exploring the effect of the different dispersants and XG to pesticide suspension and directing the choose of the ingredients of suspension prescription were studied by rheometer.The result showed that, the effect of the synergistic reaction of alkyl-phenol-polyoxythylene ether phosphate dispersant TERSPERSE4896,nonyl phenyl polyoxyethylene ether dispersant TERSPERSE2210 and XG to suspension was different.Both the rheological curves were same presented as pseudoplastic fluid when they stored in R.T(18~25℃) for 10 days,but the rheological curve of suspension with the synergistic reaction of TERSPERSE2210 and XG was changed to dilatant fluid when it stored in R.T for 150 days.It proved that the synergistic reaction was different in diverse dispersants and XG,which directly influenced the rheological property of pesticide suspension,and finally affected the physical stability.