The　bulk　nanocrystalline　Nd-Fe-B　magnets　in　forms　of　rod　and　slab　with　various　surface　area-to-volume　ratios　(defined　as　S/V)　were　prepared　by　injection　casting　into　copper　molds.　The　effects　of　the　surface　area-to-volume　ratio　and　the　application　of　magnetic　field　during　the　casting　process　on　the　magnetic　properties　and　microstructure　of　Nd9.5Fe71.5Ti2.5Zr0.5Cr1B14.5C0.5　alloy　have　been　studied.　The　results　show　that　the　samples　that　have　larger　S/V　values　exhibit　higher　H-i(c)　and　BHmax.　The　intrinsic　coercivity　of　bulk　magnet　is　more　sensitive　to　the　cooling　rate　of　alloy　melt　than　the　remanence.　The　slab-shaped　sample　cast　with　magnetic　field　has　a　stronger　(00L)　texture　of　Nd2Fe14B　phase　with　the　c-axis　perpendicular　to　the　slab　plane　than　the　slab-shaped　sample　cast　without　magnetic　field.　Applying　a　magnetic　field　during　the　casting　process　is　helpful　to　refine　the　grain　size,　thus　improving　the　magnetic　properties.