Carboxymethyl amylose was fractionated and the fractions were characterized by light scattering and viscometry. The viscosity and the molecular weight data have been used to evaluate the Mark-Houwink's constant a, expansion factor α, Flory's universal constant Φo, and unperturbed dimension of the chain. The configurational parameters, e.g., effective bond length b, Kuhn-Kuhn chain segment length Am, and steric factor σ have also been determined and compared with those of similar cellulose derivatives obtained in our laboratory.