In the present paper, we report the role of CuO chains on the superconducting properties of bilayer cuprate superconductors. The model Hamiltonian incorporates the intra-bilayer, inter-bilayer and bilayer-chain interactions. The expressions of the superconducting order parameter, transition temperature, density of states and electronic specific heat have been obtained using Green's function technique. The numerical calculations show that these properties are sensitive to the chain contributions. Our results are qualitatively in accord with the experimentally observed superconducting properties in bilayer cuprates.