Nanocrystalline nickel and micro-grained nickel was prepared by pulse electrodeposition, and the corrosion behavior of electrolytic nickel, coarsed-grained nickel and nanocrystalline nickel in 3.5%NaCl solution and 10%HCl solution was studied by soak method and electrochemical polarization method, respectively. Three nickel samples all exhibited well corrosion resistance in 3.5%NaCl solution, however, nanocrystalline nickel was easier to be corroded due to the increase of fraction of interface volum. In 10%HCl solution they also showed good corrosion resistance, the nanocrystalline Ni presented the weakest corrosion resistance among the three nickel samples.