A Prussian blue analogue coordination polymer, KCd[Cr(CN)6]8226;H2O (18226;H2O), has been synthesized based on Cd2＋and [Cr(CN)6]3－ as building blocks, which has been characterized by IR spectrum, elemental analysis, single crystal X-ray diffraction, powder X-ray diffraction, thermogravimetric analysis, and N2 adsorption and desorption measurements. 18226;H2O belongs to cubic system with space group Fm-3m, and cell parameters: a＝b＝c＝1.09059 mn, and α＝β＝γ＝90°. The structure of 18226;H2O consists of K＋, Cd2＋, [Cr(CN)6]3－ and one lattice water molecule, which forms a three-dimensional porous structure. Thermogravimetric analysis indicates that the framework of the dehydrated samples 1 is stable between 120 and 200 ℃. N2 adsorption and desorption studies suggest that the dehydrated samples 1 possesses surface area of 683.6 m28226;g－1 and the maximum adsorption of 8.83 mmol8226;g－1.