Transformation of living ring-opening metathesis polymerization into coordinationpolymerization by converting the titanacyclobutane group attached to a polynorbomene chain intotitanocene alkoxide has been used for the synthesis of polynorbornene- poly(ethylene-co-propylene)block copolyopr. Prelindnary characterizations of the copolymerization products by solventextraction and 13C NMR spectrum are reported.