In order to know the electrochemical decomposition characteristics of ammonia to nitrogen, this work has studied several experimental variables on the electrolytic ammonia decomposition. The effects of pH and chloride ion at IrO2, RuO2, and Pt anodes on the electrolytic decomposition of ammonia were compared, and the existence of membrane equipped in the cell and the changes of the current density, the initial ammonia concentration and so on were investigated on the decomposition. The performances of the electrode were totally in order of RuO2.IrO2>Pt in the both of acid and alkali conditions, and the ammonia decomposition was the highest at a current density of 80 mA/cm2, over which it decreased, because the adsorption of ammonia on the electrode surface was hindered due to the evolution of oxygen. The ammonia decomposition increased with the concentration of chloride ion in the solution. However, the increase became much dull over 10 g/l of chloride ion. The RuO2 electrode among the tested electrodes generated the most OH radicals which could oxidized the ammonium ion at pH 7.