Two assumptions were put forward as a result of analysis of the flow curves of hydrolyzed polyacrylamide-salt solution and the theory of macromolecular solution.The relationships between the zero-shear viscosity η 0 and polymer concentrations ρ p

between the constants K and n in Meter’s equation and polymer concentration ρ p were established.Therefore a universal Meter’s equation relating apparent viscosity η a with polymer concentration ρ p was deduced.The equation can be used to simulate apparent viscosity η a for the system

with an average error of 7.9% for experimental values.