Cyclohexyl-bridged cyclopentadienyl titanium catalyst of the type ［（CH2）5C（C5H4）2］ TiCl2 (C2) has been prepared by treatment of the lithium salt of cyclopentadiene ligand with TiCl4·2THF in THF solution. The complex C2 were characterized by H-NMR，13C-NMR and element analyse. Activated by MAO, complex C2 is an efficient catalyst in the polymerization of ethylene. Complex C2 displayed very high activity for ethylene polymerization under the reaction temperature of 60～70 ℃，and the viscosity-average molecular weight of polyethylene is more than 3.4×105 when reaction temperature is no more than 60 ℃ .The molecular-weight distribution measured by gel permeation reached 2.69 . High melting points measured by DSC indicates that the polyethylene produced by complex C2 is high linearity and high crystallinity.