A novel chiral 2-D layer coordination polymer [Co(Pydc)(H₂O)₂] · H₂O (Pydc = Pyridine-2,5-dicarboxylate) was hydrothermally synthesized and characterized by elemental analysis, IR spectra and TG analysis. Single-crystal X-ray diffraction shows that Co(1) was connected by the oxygen atom and nitrogen atom of different carboxyls and form a helical-shaped {O(3)-Co-N} _n chain along 2₁ helical axes. The adjacent 1-D {O(3)-Co-N} _n helical-shaped chains are developing along 2₁ helical axes with the same direction and are connected by O(4) to form an ordered 2-D layer. All the molecules exist in the same optical activity that imparts the chiral nature to the whole compound.