Abstract: The microstructure and mechanical properties of VCoNi alloy were studied by Al alloying control.The microstructure test shows that with the increase of Al content, the microstructure of the alloy changes from single-phase to FCC+BCC dual-phase structure.Mechanical properties test shows that Al addition improves the strength of the alloy, but the plasticity generally shows a downward trend.The internal mechanism is closely related to dynamic strain aging induced by Al alloying and dynamic precipitation of σ phase.