In-situ　(Ti,　Nb)C/Ni　composite　coatings　with　liquid　nitrogen　cooling　were　fabricated　on　Cr12MoV　die　steel　by　laser　cladding.　The　phase　constitution,　microstructure　characteristics,　micro-segregation　behavior　of　elements,　micro-hardness　and　wear　resistance　of　coatings　was　explored.　The　results　showed　that　the　liquid　nitrogen　cooled　coating　was　composed　of　(Ti,　Nb)C,　Cr7C3,　Cr23C6　and　gamma-Ni(Fe),　and　the　growth　of　(Ti,　Nb)C　was　restrained.　The　segregation　behavior　of　Cr,　Nb　and　Ti　elements,　crack　sensitivity　and　pores　were　remarkably　reduced.　The　nanometer　chromium　carbides　and　higher　dislocation　density　were　also　observed　by　TEM.　According　to　EBSD　results,　the　coatings　showed　stronger　textural　characteristics,　and　the　imposing　liquid　nitrogen　cooling　refined　the　microstructure　and　increased　slightly　the　high　angle　grain　boundaries.　In　addition,　gamma-Ni　matrix　in　the　liquid　nitrogen　cooled　coating　increased　the　amount　of　Nb,　Cr　and　Ti　elements,　resulting　in　higher　elastic　modulus　and　average　hardness.　The　tribochemical　reaction　was　also　occurred　during　the　wear　test　from　XPS　results.　The　liquid　nitrogen　cooled　coating　showed　excellent　wear　resistance,　and　it　was　improved　73%　than　air　cooled　coating.