[Objective]To study the scale inhibition of carboxymethyl inulin.[Method]Comparative static scale method was used to compare the scale inhibition of carboxymethyl inulin in different concentrations,pH,calcium ion concentration,temperature.[Result]The optimum anti-scaling conditions of carboxymethyl inulin were obtained:carboxymethyl inulin concentration 16 mg/L,Ca2+ concentration of less than 250 mg/L,pH 8.0,temperature 80 ℃,and the corresponding inhibition rate is 93.4%.[Conclusion]The study will provide reference for application of carbxymethyl inulin.