Abstract: High-entropy alloys have become a research hotspot in the field of materials in recent years due to their high strength, high hardness, radiation resistance and excellent high temperature stability. Because of the excellent plasticity at room temperature, CoCrFeNi alloys have received extensive attention. The control of element composition to improve the microstructure of the alloy can increase the strength of CoCrFeNi alloy. The research status of the mechanical properties of CoCrFeNi-based high-entropy alloys was reviewed. The effects of element doping and thermomechanical treatment on the microstructure and mechanical properties of CoCrFeNi alloy were investigated.