Particle reinforced metal matrix composites (PR–MMCs) have attracted extensive investigation in material science and engineering. They combine both strength and toughness and show excellent properties such as good wear resistance, corrosion resistance and high temperature properties. Laser depositing of metal matrix composite coatings containing in–situ carbide particles is a research focus in laser surface processing. The essential advantage of the in–situ synthesis technology is that the reinforcements are much more compatible with the matrix and the interface between the reinforcements and the matrix is much cleaner. It has a special advantage in high distribution density and dimension uniformity to in–situ synthesize particles by laser melting precursor powders containing several strong carbide-forming elements (SCFEs) rather than one. Each SCFE has significant effects on the precipitation and distribution of the carbide particles. To investigate the microstructure and properties of the cladded ayers, in this paper, the coatings were produced by laser cladding powders containing 2%Ti, 1%Ti+1%Zr and 1%Ti+1%Zr+10%WC (mass fraction) respectively on the surface of a medium carbon steel. The microstructure of the coatings and the carbide particles were studied by X–ray diffractometer (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The results show that the microstructure of the coatings is typically hypo–eutectic. The in–situ particles have a TiC structure with high content of Zr or W when 1%Ti+1%Zr and 1%Ti+1%Zr+10%WC are added into the cladded powders. Therefore, they are multiple carbides. The interface between the article and the ae material is strong. The optimized istribution of the particles with high distribution density (2×104 mm−2) and high dimension uniformity (about 1μm) are obtained when 1%Ti+1%Zr+10%WC are added. The wear resistance of the coating was tested throgh ring–on–block wear eperiment. It is indicated that laser cladding Fe–based composite coating reinforced by in–situ multiple carbide particles presents excellent wear resistance.