A novel poly(1-butene) was synthesized with η5-pentamethylcyclopentadienyl-tribenzyloxytitanium(Cp*Ti(OBz)3) and modified methylaluminoxane(MAO). The influence of various conditions (e.g., catalyst composition, temperature, Al/Ti, pressure of monomer, and catalyst concentration) on the catalytic activity, molecular weight of the products were investigated in detail. It was found that the catalyst exhibited highest activity of 91.3kgPB/molTi·h at T=30℃, and Al/Ti(mol/mol)=200. The catalytic activity and molecular weight were sensitive to the TMA content in MAO and external TIBA.Cataltiac activity and molecular weight were decreased with increasing the content of TMA in MAO.External addition of TIBA can deactivated the catalyst.Molecular weight of the products was increased with decreasing temperature and Ti conentration.The catalyst had the highest activity at a Ti concentration of 1.0×10-3mol/L.The molecular weight of poly(1-butene) is high,over one million by GPC method.The results showed that with this catalyst system,a high molecular weight poly(1-butene)can be synthesized.