3D　finite　element　model　(FEM)　was　built　for　the　simulation　of　temperature　and　stress　field　induced　by　laser　cladding.　The　proposed　model　was　validated　by　experimental　results.　The　numerical　width　and　depth　of　coating　matched　well　with　the　experimental　cross-section　of　macrograph.　The　viscosity　of　molten　pool　versus　the　temperature　field　was　also　discussed,　and　the　maximum　difference　of　viscosity　in　different　zones　was　approximately　32.8%.　High　temperature　and　sharp　thermal　gradient　was　generated　in　the　vicinity　of　heat　source,　which　was　prone　to　produce　residual　stress.　The　heat　distribution　obtained　from　temperature　field　was　in　consistent　with　the　thermocouple　measurements.　Due　to　large　plastic　tensile　deformation　of　materials,　the　longitudinal　residual　stress　was　susceptible　to　crack　propagation　in　the　laser　cladding.　The　measured　maximum　value　of　longitudinal　residual　stress　reached　492　MPa,　which　was　lower　than　predicts.　The　coatings　were　apt　to　crack　along　the　vertical　scanning　direction.　In　addition,　the　crack　susceptibility　of　coatings　was　not　only　depended　on　residual　stress,　but　also　the　microsegregation　of　Cr,　Ni　and　Fe　elements.　The　calculation　results　are　helpful　for　systematically　understanding　the　melt　pool,　heat　cycles,　and　stress,　which　related　to　laser　cladding　Ni-based　materials.