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Flywheel energy storage system was the energy storage equipment, which can store the electrical energy into the mechanical rotation energy. This paper had designed the key parameters for the M/G of the FESS. According to the torque balance equation, it had been accounted for a lot of states for the design, such as the electromagnetic torque was a constant function of a linear function, the damping was zero or not. Through Large precise deduced, the equations of the key parameters and the time had been received, then using them to calculated this system parameters. From that on for researchers of the M/G of the FESS what had provided principle to design of the key parameters according to difference field or system request.