Using a new instrument, the influence of the shear amplitudes0on the dynamic behavior of polymer solutions up to 700% shear was investigated. At amplitudes<∼100% shear, the dynamic viscosityη1remained constant, as required by linear viscoelasticity; however, the shear storage modulusG′decreased considerably. The steady‐state flow curve forms the envelope of curves measured with different amplitudes and frequencies, predominantly in the range of higher rates of shear. The more complete analysis of the results is forthcoming.