Al_xTiCrMnCu (x=0, 0.25, 0.5, 0.75, 1.0) high entropy alloys were prepared by laser deposition. The XRD、SEM and corrosion electrochemical testing methods were used to investigate the effect of Al on the microstructure and properties of Al_xTiCrMnCu alloys. The results show that, with the increase of Al addition, phases of Al_xTiCrMnCu alloys change from simple FCC and HCP1 solid-solutions to single HCP2 solid-solution. The microhardness of Al_xTiCrMnCu alloys increases gradually with the increase of Al addition. The corrosion resistance of Al_xTiCrMnCu alloys in 3.5% NaCl solution increases firstly and then decreases with the increase of Al addition. The optimum corrosion resistance can be obtained when x=0.25.