Bond Graph, as a graphical modeling language, can represent various physical domains in a unified form. This paper deals with the establishment of a Bond Graph model of an electro-hydraulic servovalve which consists of a torque motor, a cantilever feedback spring, and two hydraulic stages, one with a nozzle/flapper system and the other with a spool valve. The entire model can be divided into a hydraulic and a mechanical part which are connected by 2-port modulated R-elements representing orifice pressure drop and jet force phenomena, and TF-elements coupling the mechanical and hydraulic power. The Bond Graph model of whole system is then presented. Finally, using AMESim on which a model was created based on the established Bond Graph, simulation results are compared with the experimental measurements.