Abstract：In order to reflect the actual behavior of the seepage field and deformation field during the environment change and construction processes，the basic equations and finite element expressions for complete coupling analysis of transient fluid flow and elastic stress are developed according to the assumption of small deformation and incompressible fluid flow in complicated fractured rock masses. A unified hybrid media model is used to simulate the seepage field；and both the equivalent continuum media model and the discrete media model are adopted to simulate the elastic deformation field. The coupled equations are solved directly by use of the four-freedom complete coupled method with FEM. And the modified initial flow method is adopted to deal with the free surface of unconfined seepage. Finally，the above method is applied to the fractured rock bank slope of a reservoir. Both the static and dynamic coupled processes of seepage field and stress fields are simulated during the rising of water level in reservoir；and the variations of both the displacement field and the seepage field are studied. The result shows that the dynamic action of water flow for quick rising can lead to a great difference in the settlement of the reservoir bank slope and reduce the bank slope stability；but slowly rising process can be solved as the static problem.
