A reliable relation between the maximum dynamic shear modulus and the average of the two effective principal stresses applied in the directions of wave propagation and particle motion respectively is established for the dam by combining the in-situ and laboratory test results. 综合整理现场与室内试验结果,取得了对于该土坝来说较为可靠的最大动剪模量与二维平均有效应力的关系。