EPR and the use of nbberlike polyner melt blending pp is a commonly used means of modification, In blends, PP and EPR scattcred into a"sca-island" structure, The toughcning mechanism is the "sliver-striped-shear zone yield" theory. The EPR and PP both contain n-propyl,according to the Similar Comatibility Principles, they should have a better compatibility, in actual blending, the decentralization of EPR blends also depends on the processing conditions, Blending in the same conditions, if the PP and EPR have the similar of melt-viscosity, the structure of blend systems will be more evenly, By adding plasticizers DOP in PP EPR blend system, DOP can scattered in the two-phase interfacc, the interface energy can reduce, thus reducing the strcngth of the blends. Adding a third group PE. by controlling the content of PP EPR and PE EPR will play as the compatibity agent of PP and PE. and the system can fotned a special" coire-shell" structure.