Copolymerization of ethylene with styrene using linked cyclopentadienyl-amide titanium(IV) complexes, [Me 2 Si(C 5 Me 4 )(R)]TiCl 2 [R=tert-Bu (1), cyclohexyl (2)], and non-bridged (1,3-Me 2 C 5 H 3 )TiCl 2 (O-2,6- i Pr 2 C 6 H 3 ) (3)-MAO catalysts have been explored. Although the catalytic activity by 2 was lower than 1, 2 showed more efficient styrene incorporation than 1 under the same conditions. Moreover, the resultant copolymer prepared by 2 possessed completely different microstructure from those by 1, indicating that the nature of amide ligand affects both styrene incorporation and monomer sequence.