By　applying　the　spark　plasma　sintering　technology,　the　Nd　bulks　with　amorphous,　amorphous　and　nanocrystalline　mixed,　and　ultrafine　nanocrystalline　structures　were　prepared.　The　microstructures　of　the　Nd　bulks　are　characterized　by　HRTEM.　The　physical　properties　of　the　ultrafine　nanocrystalline　Nd　bulk,　such　as　the　phase　transformation　features,　the　electrical　resistivity,　the　thermal　conductivity,　and　the　coefficient　of　thermal　expansion,　as　well　as　their　evolution　rules　with　the　temperature,　were　measured　and　compared　with　those　of　the　raw　polycrystalline　bulk.　It　was　found　that　the　temperature　of　transformation　from　hcp　to　bcc　is　650　degrees　C,　which　is　reduced　by　200　degrees　C　in　comparison　with　the　raw　polycrystalline　material.　The　electrical　resistivity　is　obviously　increased　as　compared　with　that　of　the　polycrystalline　bulk,　while　the　thermal　conductivity　is　remarkably　decreased　by　about　3　times.