TiC reinforced Fe3Al intermetallic matrix composite coating is fabricated on 0.2% C carbon steel substrate by laser surface alloying with Al-TiC powders blend as the precursor material. The phases composition and microstructure of the composite coating are investigated by X-ray diffractometer (XRD), scanning electron microscopy (SEM) and energy dispersive spectrometer (EDS). Through thermodynamic calculating, the dissolution thermodynamic conditions of TiC are confirmed. The dissolution and precipitation behavior of TiC phase are discussed. Results show that the coating mainly consists of Fe3Al and TiC. During the laser surface alloying process, when the temperature reaches 2000 K～2200 K, the TiC powders used as the precursor material begin to dissolve into the Fe-Al alloy melt, as in-situ reinforcement particles re-precipitate from the melt and are scattered with a net shape in the Fe3Al matrix.