Featured with excellent physical and chemical properties, TiC has important significance and practical application value. A new method to synthesis TiC by combining laser and sol-gel technology is reported. TiO2 sol-gel coating is prepared on the surface of 45# steel and then treated by NdYAG laser. The microstructure and performance of the coating after laser treating are tested by scanning electronic microscope (SEM), X-ray diffraction (XRD), and micro-hardness tester respectively. The results show that the surface of coating is flat, and there is a metallurgical bonding between hardened coating and parent metal. The coating is consisted of Fe, TiC, and FeTiO3，and the particle of TiC with size of 1～3 μm distributes on the topside of the coating. With dispersion reinforced phase TiC, the hardness of the hardened coating increases obviously. The average micro-hardness reaches 950 HV0.1, which is 3 times more than that of substrate.