Two types of HDPE, with different MW and MWD, were melt mixed with an EPM in a twin screw extruder. SEM micrographs indicated interlocked morphologier at low EPM contents(<20 wt %), and particle-in-matrix structure was obtained as the EPM contents increase. Better rheological compatibility was obtained from blends with PE having similar viscosities to EPM, in general. Thermal analysis indicated a small increase in melting point for the blends. Small positive and negative deviations from the additive rule were noted from hardness and modulus measurements, respectively.