To improve the comprehensive performance of traditional thermal barrier coatings,introducing the rare earth oxides modified "7YSZ",which is 7wt% yttria-stabilized zirconia coating,on the surface of a titanium alloy.The Gd-YSZ coating with different Gd2O3 content was prepared on TC4 titanium alloy by laser cladding technology with yls-3000 fiber laser system.The macroscopic feature,microstructure,element distribution,phase structure and microhardness distribution of the coating were characterized by optical microscope,SEM,EDS,XRD and hardness tester respectively.The introduced Gd exists in the form of the rare earth-rich second phase Al3Gd and oxide,and a small amount of solid solution in ZrO2 and α-Ti lattice leads to lattice distortion,improves the thermal insulation performance of the material.Rare earth Gd can inhibit the harmful phase TiO2 and promote the reinforced phase TiC precipitation and optimize its distribution.The microhardness of the microstructure can be improved by refining the grains and optimizing the growth of TiC,the optimization effect is significantly weakened when the amount of Gd is increased to 10wt%.Doping Gd2O3 in 7YSZ cladding material system can significantly improve the comprehensive properties of the material,the amount of Gd2O3 is the key factor affecting the properties,which should not exceed 10 wt%,otherwise the grains will be coarsened,resulting in the Gd segregates and accumulates at the grain boundary,which deteriorates the properties of the materials.