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.