Abstract: ABSTRACT:Maleic anhydride grafted HDPE (HDPE-g-MAH) and HDPE-g-MAH/PA6 blend alloy were prepared by melt grafting. The grafting degree was controlled by alternating the ratio of maleic anhydride and dicumyl peroxide. The relationship between the properties of HDPE-g-MAH/PA6 blend alloy and the graft ratio of HDPE-g-MAH was studied. The results indicated that the mechanical properties and heat resistance of HDPE-g-MAH/PA6 blend alloy increased compared pure HDPE. The better properties of the blend alloy were observed when the ratio of HDPE:PA6:MAH:DCP was 60:40:1:0.3.