Abstract: Aiming at the problem of low hardness and poor wear resistance of Ti811 titanium alloy, the experiments of laser cladding by synchronous powder feeding laser cladding technology to prepare wear-resistant composite coatings were made. TC4 powder, Ni45A powder and Y₂O₃ powder were used as cladding material. The microstructure and the phase composition were analyzed. The mechanical properties of composite coating such as microhardness and friction and wear properties were tested. The research results show that the coating is made up of dendritic TiC, TiC nanoparticles grown on the surface of dendritic TiC, equiaxed spherical (nearly spherical) TiC grown on the surface of matrix, intermetallic compound Ti₂Ni, reinforced phases TiB, TiB₂ and matrix α-Ti. The phases are uniformly dispersed in the coating. The composite phase structure is consisted of equiaxed spherical (nearly spherical) TiC and Y₂O₃.The two-dimensional lattice mismatch calculation shows that the two-dimensional lattice mismatch between the (111) crystal plane of Y₂O₃ and the (110) crystal plane of TiC is δ=6.54%, which indicates that Y₂O₃ can act as the effective heterogeneous nuclei of TiC to refine grains. The microhardness is between HV_0.5 655 and HV_0.5 700, which is about 1.6 to 1.8 times higher than that of the Ti811 substrate. The wear mechanism of the coating is mainly abrasive wear, the friction and wear properties are significantly improved compared with the substrate.