不对称滞回特性是一种特殊的非线性性质。文献 [1]提出了具有典型意义的分段线性和分段曲线不对称滞回模型 ,本文则给出了一类具有统一形式的分段线性不对称滞回模型。在微分型滞回模型 (Bouc_Wen模型 )的基础上 ,本文引入指数δ ,得到微分形式的不对称滞回模型。另外 ,文章还讨论了随着振动作用不断持续 ,滞回参数产生慢变的一些现象和规律。 Asymmetric hysteresis is a special non-linear nature. In [1], a typical piecewise linear and piecewise curve asymmetric hysteresis model is proposed. In this paper, a class of piecewise linear asymmetric hysteretic model with uniform form is given. Based on the differential hysteresis model (Bouc_Wen model), the index δ is introduced in this paper to obtain the differential form of the asymmetric hysteresis model. In addition, the paper also discusses some phenomena and regularities of the hysteresis parameters changing slowly with the continuous vibration.