Abstract: In order to study toughening and modification effect of different types elastomers on polypropylene, polypropylene/elastomer blend materials were prepared by melt blending method, and melt crystallization behavior, microstructure, dielectric properties, low temperature impact resistance and bending properties of polypropylene/elastomer blends were investigated by differential scanning calorimeter, scanning electron microscope, dielectric spectrumtest system, low temperature impact test chamber and other equipment.Results showed that the five elastomers were dispersed particles in polypropylene matrix, which could effectively enhance the toughness of polypropylene, improve its low temperature impact resistance, and meet impact resistance requirements under the temperature of -25 ℃.Combined with improvement of bending modulus, YH-06 had the best toughening effect on polypropylene, followed by C3080, 2032PM and CA 10A, and CA 60A was relatively poor.Existence of elastomer could inhibit crystallization of polypropylene material, which showed that melting enthalpy and crystallinity of polypropylene decreased.Impact stress whitening of blend show ed that YH-06 had the best toughening effect on polypropylene, followed by C3080 and 2032PM, and CA 10A and CA 60A were relatively worse.Dielectric properties test showed that C3080 and 2032PM could reduce electrical properties of polypropylene materials, and dielectric loss angle tangent value increased rapidly at the temperature of 90 ℃, resulting in polypropylene blend material could not meet dielectric properties requirements.For comprehensive consideration, YH-06, CA 10A and CA 60A could be selected as modifying materials for polypropylene to improve electrical and mechanical properties of polypropylene cables.