One new cadmium coordination polymer, [Cd(nbdc)(dmpy)]_n (1, H₂nbdc = 2-Nitroterephthalic acid, dmpy = 5,5' -dimethyl-2,2' -bipyridine) has been synthesized under hydrothermal conditions and characterized by elemental analysis, IR spectroscopy, thermogravimetric analysis (TGA), and single-crystal X-ray diffraction. Complex 1 is of monoclinic system, space group C2/c with a = 11.7684(9), b = 24.3715(19), c = 13.9898(11) Å, β = 107.652(2)°, V = 3823.5(5) ų, C₂₀H₁₅N₃O₆Cd, Z = 8, M_r = 505.75, D_c = 1.757 g/cm³, μ(MoKα) = 1.187 mm^-1, F(000) = 2016, the final R = 0.0207 and wR = 0.0560 for 3034 observed reflections with I > 2σ(I). 1 exhibits an interesting one-dimensional double chain structure. Furthermore, the luminescent property of 1 has also been investigated.