The　structure　and　magnetic　properties　were　studied　for　bulk　nanocrystalline　dysprosium　(Dy)　metal　prepared　by　spark　plasma　sintering　method.　All　the　as-prepared　samples　have　hexagonal　close　packed　structure.　A　decrease　in　grain　size　results　in　remarkable　changes　in　magnetic　ordering　temperature　of　the　nanocrystalline　Dy　metal.　At　5　K,　the　magnetization　drops　by　3.35%,　and　the　coercive　force　increases　by　three　times　for　nanocrystalline　Dy　compared　to　those　of　coarse-grained　bulk　Dy　sample.　These　results　indicate　the　remarkable　influence　of　the　nanostructure　on　the　magnetism　of　Dy　due　to　finite　size　effect.