在建立多相介质夹杂问题的自治模型基础上，应用自治有限元法研究了多相介质的平均弹性性能问题，通过数例讨论了在不同体分比下，界面对多相介质总体平均弹性性能的影响，结果表明，界面厚度对多相介质横向平均剪切模量和横向平均体积模量有明显的影响，而对纵向平均拉伸模量影响不大。为了进一步研究界面破坏特征，本文还分析了多相介质界面区域的应力场。 Based on the autonomous model of multiphase media inclusion problems, the autonomic finite element method is used to study the average elastic properties of multiphase media. The numerical results show that the average elastic properties of multiphase media at different volume fractions are discussed. The results show that the interfacial thickness has obvious influence on the transverse average shear modulus and transverse average bulk modulus of multiphase media, but has little effect on the average longitudinal tensile modulus. In order to further study the interface damage characteristics, this paper also analyzes the stress field in the interface of multiphase media.