Abstract: CrCoNi ternary medium entropy alloys have single-phase FCC structure, high plasticity and easy to produce work hardening phenomenon. However, CrCoNi alloys still have the problem of low yield strength, need to be further strengthened to improve its performance. The common strengthening methods of CrCoNi alloys were introduced from the aspects of alloying element addition, cold and hot deformation process and heat treatment, and their effects on the strengthening mechanism and properties of CrCoNi alloys were summarized.