In　this　paper,　in　situ　(Ti,　Nb)C　particle　((Ti,　Nb)C-p)　reinforced　Fe-based　composite　coatings　were　produced　by　laser　cladding　on　the　surface　of　the　high　carbon　steel.　The　effects　of　heat　input　on　the　microstructure,　distribution　characteristics　of　particle,　and　mechanical　properties　of　the　coating　were　investigated.　The　results　show　that　(Ti,　Nb)C　multiple　carbide　particle　is　synthesized　during　solidification　of　molten　pool.　The　size　of　particle　coarsens　gradually,　the　area　ratio　of　particle　increases,　and　the　amount　of　particles　presents　a　non-monotonous　variation　with　the　increase　in　energy　density.　The　mechanical　properties　of　the　coating　are　improved　dramatically　compared　with　those　of　the　substrate,　benefiting　from　its　higher　hardness　and　dispersed　in　situ　(Ti,　Nb)C-p　in　it.　With　the　change　in　heat　input,　the　mechanical　performances　of　the　coating　vary　except　the　hardness.　When　energy　density　is　1x10(5)Jmm(-2),　tensile　strength　and　wear　resistance　of　the　coating　achieve　optimal　value　due　to　moderate　content　and　size　of　the　particle　in　the　coating.