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Reactions of Cd(OAC)2·2H2O with m-thioacetatebenzoic acid(H2L)and 1，10-phenanthroline(phen)give rise to a metal-organic framework，[CdL(phen)]n(1)．X-ray single-crystal diffraction reveals that 1 crystallizes in the monoclinic system，space group C2/c，with a=25．7099(5)，b=10．3872(2)，c=19．1820(4)（A），β=131．114(1)°，V=3859．4(1)(A)3，Mr=502．80，Z=8，F(000)=2000，μ=1．271 mm-1，Dc=1．731 g·cm-3，the final R=0．0226 and wR=0．0559 for 3817 observed reflections(I>2σ(I))．1 displays a 1D double-strand chain structure with crab-like dinuclear subunits，and extends into a 3D network by π-π interactions and C-H…O hydrogen bonds．Photolumineseenee studies reveal that it aisplays intense structure-related fluorescent emission bands(λex=342 nm)at 370．5 and 389 nm in the solid state at room temperature．