Ring-opening metathesis polymerization of dicyclopentadiene catalyzed by TiCl4 . 2L/CH3Li system [where L is tetrahydropyran (I), dioxane, 2,5-dimethylfuran, or tetrahydrofurfyl alcohol] is reported. The obtained polymer was characterized by IR and H-1-NMR. These catalytic systems effectively promoted the polymerization reaction. Seven influencing factors are discussed. When the aging temperature was 0 degreesC, the aging time was 90 min, the polymerization temperature was 60 degreesC, Li/Ti was 1.5-2, and the monomer/catalyst molar ratio ranged between 30 and 50, the polymerization reaction catalyzed by complex 1 yielded better results within a shorter period of time.