Abstract: The annealed microstructure, hardness and electrochemical property of the AlFeCoNiCrTiV0.5 high-entropy alloy were studied by using XRD, SEM, DSC and Rockwell apparatus, etc., The results show that the peak position of bcc1 and bcc2 phases approached gradually with the increase of annealing temperature. Diffraction peaks of the two phases coincided at lower angle when the annealing temperature reached 900 ℃. The bcc1 phase transformed to fcc phase when the temperature reached 1 100 ℃. The hardness of the alloy kept 52.3 HRC when the annealing temperature was up to 1 100 ℃ and the alloy exhibited superior resistance to tempering and softening property. The alloy had lower corrosion rate than 304 stainless steel in 0.5 mol·L-1 H2SO4 solution. The corrosion rate of the alloy was similar with 304 stainless steel in 1 mol·L-1 NaCl solution, but their corrosion resistance property was better than 304 stainless steel.