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A new coordination polymer[Cd(bic)(phen)]n(H2bic=lH-benzimidazole-5-carboxylic acid;phen=1,10-phenanthroline)has been obtainedby using hydrothermal synthesis andcharacterized by elemental analysis,IR,TG,fluorescence spectrum and X-ray diffraction.The crystal belongs to orthorhombic,space group Pbca with a=17.609(4),b=9.382(2),c=20.504(4),V=3387.4(1)3,Z=8,Dc=1.779g/cm3,F(000)=1800,μ(MoKa)=1.313mm-l,the final R1=0.0351and wR2=0.0776 for 2320 observed reflections(I>2a(I)).In complex,H2bic molecules link the Cd ions to form 2D layer structurebyμ3-(η2-O1,O2),N3,N4coordination mode,and further extended into a 3D supramolecular framework throughπ-πinteractions.The result of TG analysis shows that the title complex is stable under 395.0X1.In addition,Solid-state emission spectrum of complex showsluminescence with emission peak at 486.00 nm.