Cu(OH)2 nanoribbons template provides a simple way for producing arrays of copper oxalate nanorods and assemblies with controllable size and shape of the arrays of copper oxalate in situ reaction on Cu(OH)2 nanoribbons. The observations of scanning electron microscopy and characterization of X-ray powder diffraction and Fourier transmission infrared spectrometry show formation of the arrays of cubic column nanorods, nanotubes, and corn-like nanorods of CuC2O4 by controlling the concentration of oxalate solution and reaction time. We believe this approach can also be applied for synthesis of inorganic and inorganic/organic material architectures.