Accurately obtaining multi-field information of reservoir landslides under dynamic water action is an important foundation for landslide deformation mechanism and stability analysis. Although GeoStudio and FLAC3D are commonly used numerical software for simulating multi-field information in reservoir landslides, they still have several limitations. This paper proposes a multi-field information simulation analysis method of reservoir landslide fed by GeoStudio and FLAC3D. Time-varying seepage field of reservoir landslide under dynamic water is obtained by GeoStudio firstly, and an interface program is developed to realize the fast conversion of the GeoStudio model and seepage field to FLAC3D. Subsequently, incorporating the hydro-mechanical behavior of the geological materials and the principle of effective stress, the material parameters and initial stress of the FLAC3D model are modified to calculate the deformation of the reservoir landslide to realize a fast simulation of the multi-field information evolution process of reservoir landslide under dynamic water. The validity of the proposed method is verified by a large-scale physical model test of a reservoir landslide. The research results provide a feasible way for numerical analysis of the evolution mechanism and stability analysis of reservoir landslides under dynamic water.