Aqueous solutions have found broad usages as lubricants, in conjunction with other possible utilizations, in metal working and other industries. Due to the inferior lubricity, functional additives are needed to improve their tribological performances, including oil-in-water (O/W) emulsions or aqueous surfactants. The rheology of aqueous solution with polyethoxylated ether added (PEOE) is measured, including the influences of the temperature and the concentration on dynamic viscosity variation. The dynamic viscosity of PEOE aqueous solutions increases with PEOE concentration. The dynamic viscosity of PEOE aqueous solutions decreases with the rise of temperature up to cloud points. If the temperature is higher than cloud points, however, the dynamic viscosity will increase, through which a non Newtonian characteristic, i.e., the shear thinning, is expressed.