We have successfully synthesized MnO/C nanorod arrays which is the first report of MnO/C nanoarrays derived from Mn-MOFs nanoarrays as precursor, and the contents of C are dependent on the temperature of calcinations of MOFs. The MnO/C-350 nanorod array electrode materials exhibit excellent electrocatalytic performances for oxygen evolution reaction; only a small over-potential of 329 mV versus RHE is needed for a current density of 20 mA cm(-2) with a Tafel slope of 70.02 mV dec(-1), and the material of MnO/C nanoarrays are superior to all reported MnO catalysts.