层错能的CrCoNi基（中）高合金在室温或低温下具有优异的断裂韧性。同时，在冲击条件下变形机理的多样性使CrCoNi基(中)高熵合金具有优异的抗变形能力,有望作为抗冲击结构材料被应用于极端环境中。然而,金属材料“强度-塑性"的倒置关系在CrCoNi基(中)高合金中依然存在,低的屈服强度限制了CrCoNi基(中)高熵合金的潜在应用。因此,选择合适的强化方法，提高CrCoNi基(中)高熵合金的屈服强度,同时保持高塑性,成为目前高熵合金研究的热点。本文从固溶元素、晶内缺陷、相结构3个方面介绍了目前应用在CrCoNi基(中)高熵合金中的强化方法,从固溶原子、间隙原子、位错、李晶、相变、梯度结构等多方面讨论了强韧化机制,并以CrCoNi基(中)高嫡合金的变形机理为切人点，分析了不同方法对合金性能的提升机理，为低层错能高强韧合金的设计提供了思路。 

rCoNi-based medium- or high-entropy alloys with low stacking fault energy have excellent fracture toughness at room temperature or low temperature. Moreover, under impact conditions, the variety of deformation mechanisms imparts excellent deformation ability to CrCoNi-based medium- or high-entropy alloys, which can be used as impact-resistant structural materials in extreme environments. However, the dilemma of "strength-plasticity" in metallic materials is still observed in CrCoNi-based medium- or high-entropy alloys, and the low yield strength limits the potential application of CrCoNi-based medium- or high-entropy alloys. Therefore, selecting appropriate strengthening methods to improve the yield strength of CrCoNi-based medium- or high-entropy alloys while maintaining their high plasticity has become a hotspot in the research of high-entropy alloys at present. This article introduced the strengthening methods  currently applied in CrCoNi-based medium- or high-entropy alloys from three aspects: solid element, lattice defects, and phase structure. Various strengthening and toughening mechanisms, such as solid solution elements, interstitial atoms, dislocations, twinning, phase transformations, and gradient structures, were reviewed. By learning from the deformation mechanisms of CrCoNi-based medium- or high-entropy alloys, the different strengthening mechanisms and their impact on the increase in mechanical properties were analysed, providing ideas for the design of high-strength and high-toughness alloys with low stacking fault energy.