The boron trifluoride etherate, BF 3 OEt 2 , was used as an activator towards bis(acetylacetonate)palladium precursor in the polymerization of norbornene. The catalyst system Pd(Acac) 2 /BF 3 OEt 2 was highly active in the polymerization of norbornene, resulting in completely soluble polymers. Catalytic activity up to 20,220 kg/(mol Pd h) and intrinsic viscosities up to 2.64dL/g were observed, respectively. Catalytic activity, polymer yield and polymer molecular weight can be controlled by varying the reaction parameters. The molar mass distribution indicates a single-site, highly homogeneous character of the active catalyst species. Glass transition temperatures (T g ) ranged from 346 to 365 o C. NMR spectroscopy study of the polymer showed exclusively 2,7-enchained repeating units of polymer backbone.