A new Cd(Ⅱ) coordination polymer, namely {Cd_2(L)(biimpy)(H_2O)}_n(1, H4 L = 3-(3?,5?-dicarboxylphenoxy)phthalic acid, biimpy = 2,6-bis(1-imdazoly)pyridine), has been successfully synthesized via the hydrothermal reactions of Cd(Ⅱ) ions, H_4L and biimpy. The crystal structure is of triclinic, space group P1 with a = 7.7874(5), b = 9.9716(5), c = 18.5278(6) ?, α = 91.327(4), β = 96.689(4), γ = 111.896(5)o, V = 1322.39(12) ?~3, C_(27)H_(17)Cd_2N_5O_(10), M_r = 796.26, Z = 2,D_c = 2.000 g/cm~3, F(000) = 780, μ = 1.679 mm~(-1), R = 0.0345 and wR = 0.0767 for 3890 observed reflections(I > 2s(I)). Single-crystal X-ray structural analysis reveals that compound 1 features a three-dimensional(3D) framework based on two different dinuclear [Cd_2(COO)_2] building subunits, and topological analysis shows that it can be simplified into a binodal(4,6)-connected topological network with the point symbol of {3.4~2.5~2.6}{3~2.4~2.5~2.6~4.7~4.8}. Moreover, the thermal stability and luminescent property of compound 1 were also studied. A new Cd (II) coordination polymer, namely, {Cd_2 (L) (biimpy) (H_2O)} _ n (1, H4 L = 3- (3 ?, 5? -dicarboxylphenoxy) phthalic acid, biimpy = (1-imdazoly) pyridine, has been synthesized via the hydrothermal reactions of Cd (II) ions, H_4L and biimpy. The crystal structure is of triclinic, space group P1 with a = 7.7874 (5), b = 9.9716 , C = 18.5278 (6) ?,? = 91.327 (4),? = 96.689 (4),? = 111.896 (5) o, V = 1322.39 (12)? 3, C 27 H 17, F = (000) = 780, μ = 1.679 mm -1, R = 0.0345 and wR = 0.0767 for 3890 at ref90 (I> 2s (I)). Single-crystal X-ray structural analysis reveals that compound 1 features a three-dimensional (3D) framework based on two different dinuclear [Cd_2 (COO) _2] building subunits, and topological analysis shows that it can be simplified into a binodal (4,6) -connected topological network with the point symbol of {3.4-2.5-2.6} {3-2.4-2.5-2.6-4.7-4.8}. Moreover, the thermal stability and luminescent p roperty of compound 1 were also studied.