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• La 2 O 3 improved the temperature gradient and reduces crack susceptibility. • La 2 O 3 promoted nucleation and grain refinement and increases dislocation density. • La 2 O 3 doping increased the hardness of the coating and improved the wear pattern. In this study, CoCrFeNiMoSi and CoCrFeNiMoSi + 0.5 % La 2 O 3 High entropy alloy (HEA) coatings were prepared by laser cladding. The microstructure was consisted mainly of body-centered cubic structure, face-centered cubic structure and intermetallic compounds of Si. The addition of rare earth La 2 O 3 resulted in the refinement and uniformity of the CoCrFeNiMoSi + 0.5 % La 2 O 3 HEA coating grains, leading to an increase in microhardness from 430 HV to 520 HV. Additionally, the friction coefficient decreased by 0.15 and the wear rate decreased by 2/3. These findings indicate that the appropriate addition of La 2 O 3 has significant potential in enhancing the friction and wear performance of HEA coatings. [ABSTRACT FROM AUTHOR]