Amorphous nickel hydroxide powder was prepared successfully by the method of micro emulsion deepfreeze deposition. Using tiny electrode of sample powder as researching electrode, Pt as assistant electrode and Hg-HgO as referenced electrode, we tested the polarization curve of amorphous Ni(OH)2 powder and calculated j0 and jd. The resalt showed that the number of electron exchange on charging and discharging was 1.35 according to our approximate calculation, and its theoretical discharge capacity was 393.26 mAh/g, so it has high electrochemical capacity.