In this paper,based on the excavation disturbed problems and then analyzed the seepage field when the exaction effects were taken into account or not of the caverns of underground powerhouse in the left bank of hydropower station,which using the strain-dependent permeability tensor model combine with finite element method.Researches show that: the change ratio ofpermeability of the rock around powerhouses up to 2~3 magnitudes and the size of influenced area related to excavation spatial dimensions;the excavation have a great impact on the seepage field especially near caverns,and free surface have been reduced;when consider the effect of excavation,the leakage of powerhouse be increased and maximum hydraulic gradient decreased slightly.Research achievements can provide relevant theoretical basis for optimization of seepage control system of powerhouse,and also provide references for other similar excavation.