基于含内变量的不可逆过程热力学的基本原理，首次建立了在超塑变形过程中的内部损伤演变方程，其损伤变量（Ｄ）与等效应变（ε＿ｅ）之间呈现一种非线性关系，它较好地反映了超塑性材料（特别是空洞敏感性材料）的损伤行为。同时，应变状态对超塑性材料的损伤变量有着重要影响，为了验证本文提出的损伤模型，进行了铝合金ＬＹ１２ＣＺ和黄铜Ｈ６２在不同加载路径下的超塑实验，研究表明理论预测与实验结果具有较好的一致性。 Based on the basic principle of irreversible process thermodynamics with internal variables, the internal damage evolution equation was established for the first time in the process of superplastic deformation. There is a nonlinear relationship between the damage variable (D) and the equivalent strain (ε_e) Good reflection of the superplastic material (especially hollow-sensitive material) damage behavior. At the same time, the strain state has an important influence on the damage variables of superplastic materials. In order to verify the damage model proposed in this paper, superplastic experiments of aluminum alloy LY12CZ and brass H62 under different loading paths were carried out. The results show that the theoretical prediction and experimental results have Better consistency.