By using different anionic ancillary ligands, two new coordination polymers, [Cd（L）I_2]_n（1） and {[Cd（L）_2（1,4-bdc）]·H_2O}_n（2）（L = 2,4,6-tris（4-pyridyl）pyridine, 1,4-H_2bdc = benzene-1,4-dicarboxylic acid）, have been synthesized under hydrothermal conditions. Compound 1 crystallizes in monoclinic, space group C2/c with a = 11.625（2）, b = 13.871（3）, c = 13.676（3） A, β = 108.11（3）°, V = 2096.0（7）A3, D_c = 2.144 g/cm^3, C_（20）H_（14）I_2N_4Cd, M_r = 676.55, F（000） = 1264, μ（MoKα） = 3.999 mm^（-1）, Z = 4, Rint = 0.0308,（Δρ）_（max） = 0.354,（Δρ）_（min） = 0.289, R = 0.0332 and wR = 0.0721 for 2401 observed reflections（I 〉 2σ（I））. However, compound 2 crystallizes in triclinic, space group P1 with a = 10.315（2）, b = 14.060（3）, c = 15.090（3） A, β = 98.40（3）o, V = 1990.0（9） ？~3, D_c = 1.527 g/cm^3, C_（48）H_（34）N_8O_5Cd, M_r = 915.23, F（000） = 932, μ（MoKα）= 0.610 mm^（-1）, Z = 2, Rint = 0.0776,（Δρ）_（max） = 0.869,（Δρ）_（min） = 0.843, R = 0.0815 and wR = 0.1930 for 6999 observed reflections（I 〉 2σ（I））. Compound 1 is a 1D chain structure, which adopts inorganic anion I- as the counterion, and 2 exists a 2D（4,4） network constructed by benzene-1,4-dicarboxylic acid.
