Melt rheological properties of blends of polypropylene (PP) and PP grafted with maleic anhydride (PP-g-MA) are studied using a capillary rheometer. A pseudoplastic flow behavior is observed. The pseudoplasticity of the melt reduces with an increase of PP-g-MA content and/or temperature. The PP-g-MA. component in the blend acts as decreasing melt viscosity, especially in the lower shear rate region, while the addition of PP-g-MA to PP does not cause obvious increase of die swell ratio.