Under hydrothermal condition, the reaction of 3-hydroxy-1-adamantaneacetic acid (H_2L) with CdCl_2 and 1,3-di-4-pyridylpropane (dpp) has afforded a new Cd(Ⅱ) compound, [CdCl(HL)(dpp)(H_2O)]_n·nH_2O (1), which was structurally characterized by single-crystal X-ray diffraction analysis. The crystal is triclinic, space group P1 with α= 1.091 0(1) nm, b=1.131 8(1) nm, c=1.246 4(1) nm, α=88.52(1)°,β=71.34(1)°, γ=68.11(1)°, V=1.345 2(1) nm~3, Z=2, M_r=591.40, F(000)=608, D_c= 1.460 g·cm~(-3), μ=0.947 mm~(-1), the final R=0.040 1 and wR=0.104 0 for 4 950 observed reflections (I>2σ(I)). Complex 1 consists of one-dimensional chains deriving from CdCl(HL)(H_2O) units linked by dpp ligands, and lattice water molecules decorate between the chains. The O-H……O and O-H……Cl hydrogen bonds lead to the formation of a 2D layer structure.