Abstract: Homo-polypropylene/polyolefin elastomer blends (PPH/POE) and PPH/POE/talc composites were prepared by twins-screw extruder. The crystallization behavior and mechanical property of the blends and composites were studied. The results showed that the mechanical property of PPH was affected by adding POE. The impact strength of PPH/POE blends increased by the increasing POE content. However, the tensile strength was decreased. The impact strength increased from 2.1 kJ/m2 to 39 kJ/m2, and the tensile strength was decreased from 30 MPa to 22MPa, when the POE content was 20 %. The tensile strength can be improved when adding the talc, the tensile strength can reach 24 MPa when the talc content was 1 phr. Besides, the crystallization behavior of PP was not greatly affected by the inducing of POE. With the increasing POE content, the crystallinity of PP obviously decreased.