The　advanced　negative　thermal　expansion　(NTE)　properties　of　the　ultrafine-grained　Mn-3(Cu1-xGex)N　compound　bulk　have　been　reported.　The　developed　preparation　route　has　reduced　the　fabrication　time　by　more　than　ten　times　in　contrast　to　previous　studies.　As　compared　with　the　coarse-grained　compound　bulk,　the　NTE　start　temperature　of　the　ultrafine　Mn-3(Cu1-xGex)N　(x　=　0.5)　bulk　is　reduced　to　250　K,　and　the　coefficient　of　negative　thermal　expansion　(CNTE)　reaches　-23.7　x　10(-6)　K-1,　which　is　remarkably　improved.　It　is　found　that　the　nitrogen　content　in　the　starting　manganese　nitride　also　has　significant　effects　on　the　NTE　start　temperature,　operating　temperature　range　and　CNTE.