Al0.5Cr0.9FeNi2.5Vx (x =0,0.2,0.4,0.6,0.8,1.0) multi-principal alloys were prepared by vacuum arc melting.The effect of vanadium addition on its microstructure and properties was investigated.The results show that the alloys of all components exhibited an FCC single-phase structure.With the addition of vanadium,the microstructure of the alloy changed from den-drites to equiaxed crystals,the grains were remarkably refined,and the layered CrV phase was exhibited,which improved the properties of the alloy.The yield strength of the alloy was slightly improved,and the alloys with various components presented good plasticity.When V content reached 0.8,the yield strength was 600 MPa,and no fracture occurred.Friction-wear testing showed that the wear debris was reduced with the addition of V element.The sample with V element content of 0.4 had the best friction and wear performance.The surface grooves became shallow,the worn debris was less,and the wear mechanism was mainly abrasive wear.The polarisation curve showed that the alloy with V element content of 0.2 has the best corrosion resistance.The passivation interval reached 900 mV.The corrosion potential and the corrosion current density were-496.299 mV and 2.759 μA/cm2,respectively.