Airborne Integrated Electromechanical Management System (IEMS) is a safety critical system, ensuring the aircraft normal flight and the normal operation of each function of the plane. Analysis was made to the IEMS of the current fighter aircrafts, such as EAP, F-22 and F-35. A model based IEMS architecture modeling and simulation method was proposed, a common model of IEMS was established, thus the modeling and simulation process of IEMS was obtained. A monitoring algorithm based on state machine and truth table, and a redundancy management algorithm were designed based Simulink. Finally, the IEMS of a certain type commercial aircraft was used for modeling and simulation, which verified the feasibility, accuracy and effectiveness of the modeling method.