The mechanical properties and fluidity of HDPE/vulcanized rubber powder blend are studied. The experiment results showed that the vulcanized rubber (x)wder had good mixing property with HDPE. When the content of rubber powder is increased, the impact strength of the blend is improved, but the tensile strength and fluidity of the blend are decreased. The mechanical properties of the bend are significantly increased by using 5% PE-g-MAH for being compatible.