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The EMDS (E-motor Drive System), as the core powertrain system of the EV/HEVs, which safety is becoming more and more critical. Meanwhile, the newly released ISO26262 standard rules the functional safety for E/E systems in vehicles, and provides a framework for developing automotive products that are safe from E/E system malfunctions in passenger vehicles. This paper mainly presents the functional safety concept development of the EMDS for a state-of-the-art P2 hybrid powertrain architecture according to the ISO26262 standard, including system architectures and item definition, hazard analysis and risk assessment, functional safety concept and technical safety concept. In the development of functional safety concept, the ASIL decomposition is also applied between requirements regarding main functionality and monitoring process, and obtains functional safety requirements based on a preliminary architecture.