The invention discloses a damping polarity discriminating method and system for a speed regulation system of a generating seat and a storage medium. The damping polarity discriminating method comprises that oscillation data of a generator in a frequency oscillation process is obtained, and the oscillation data as an input value is provided for a generating set model to obtain a simulation power ofthe generator; and the power of the generating set is detected to obtain a practically measured power, the simulated power is compared with the practically measured power, and the damping polarity isdetermined according to a comparison result.