Abstract: Four types of polyphthalamide (PPA) resins were incorporated into metallocene polyethylene (mPE) at four different weight fractions to modify its processing properties. As a result, the main engine load and die pressure of twin-screw extruder or film blower were reduced effectively during the extrusion process. The effect of PPA on the mechanical, optical and rheological properties of mPE was investigated. The results indicated that the modification effect of PPA was not only related to the weight fraction of PPA resins but also related to the content and type of dispersant. The critical shear rate of mPE powders was found to increase from 281 s-1 to 1 400 s-1 with addition of PPA, suggesting a significant improvement in processability. Moreover, the introduction of PPA affected the tensile properties, dart impact strength and optical properties of mPE films. The haze of the film decreased to 12.4 % in the presence of PPA-4, whereas the mPE achieved the dart impact strength of 71 g due to the addition of PPA-3. The optimum additive amount of PPA is strongly dependent on the practical requirements.