Abstract: Polyvinyl alcohol(PVA)/high density polyethylene(HDPE) blends were prepared via melt blending with high density polyethylene-graft-maleic anhydride(HDPE-g-MAH) added to the blends for compatibilization.Effects of blend composition and content of compatibilizer on the phase morphology,dynamic rheological properties,phase continuity and mechanical properties of the blends were investigated using scanning electron microscope,small amplitude oscillatory shear,solvent extraction and tensile measurement.Results indicated that a relatively co-continuous structure was generated when the mass fraction of HDPE was 20%-30%,in which case a second plateau was observed from the storage versus frequency curves.The continuity of PVA phase calculated by solvent extraction reached approximately 98%.The elongation at break also experienced a significant increase from 5% to 25%.In addition,the phase interface of PVA/HDPE/HDPE-g-MAH blends blurred as the HDPE-g-MAH content increased,meanwhile the mechanical performance improved.