Abstract: In order to investigate the effect of Ti addition on the microstructure and properties of AlCrFe₂NiCu high-entropy alloy, AlCrFe₂NiCu and AlCrFe₂NiCuTi high entropy overlay alloys were prepared on the surface of Q235 low carbon steel plate using plasma overlay welding technology. The phase structure and microstructure of the alloy were analyzed by XRD, SEM, EDS and EBSD, and the microhardness and wear resistance of the alloy were tested by Vickers hardness tester and abrasive wear tester. The results indicate that both alloys are mainly composed of FCC, BCC1 and BCC2 phases. The solid solution structure of BCC1 is Fe-Cr phase, the solid solution structure of BCC2 is Ni Al phase, and the solid solution structure of FCC is Cu rich phase. At the same time, Laves phase is generated in AlCrFe₂NiCuTi alloy, which is TiFe₂ phase.The morphology of the alloy changes from typical dendritic to petal-like equiaxed crystals after the addition of Ti. The addition of Ti element increases the hardness of the alloy from 410.0 HV to 522.6 HV, reduces the wear mass loss from 1.36 g to 0.42 g, refines the grain size by 43.6%, and significantly improves the wear resistance. The wear mechanism is abrasive wear.The improvement in microhardness and wear resistance of AlCrFe₂NiCuTi alloy is mainly due to the combined effect of fine grain strengthening, solid solution strengthening, and second phase strengthening caused by the addition of Ti element. The Laves phase with higher hardness precipitates in the ID region, forming a wear-resistant skeleton that greatly hinders the movement of abrasive particles on the alloy surface during wear test, thereby significantly improving the wear resistance of the alloy.