Annealing behavior of AlCoCrFeNiTi0.5 high entropy alloy coatings prepared by laser cladding was investigated in this paper. The specimens were annealed at 900℃ for five hours. The microstructure and wear resistance property of the as-annealed and as-cast specimens were investigated in this study. The XRD results indicated that the as-annealed AlCoCrFeNiTi0.5 high entropy alloy coating was composed of Al80Cr13Co7, Co3Ti, and AlFe solid solution phase. The SEM results and EDS data showed that a typical spinodal decomposition structure with uniform composition formed after annealing treatment. The average Vickers micro-hardness of the as-annealed coatings could reach 989HV0.5 which was increased about 73.5% compared with that of the as-cast coatings. The abrasion resistance testing showed that the abrasion loss of the as-annealed coatings was reduced about 92.5% and the wear width was reduced about 50% compared with the values of as-cast coatings.