The working reliability of aircraft generator is related to air transport security. Aimed at the problem of fault detection of the internal stator winding in aircraft generator, a detection method based on the empirical mode decomposition(EMD) algorithm was proposed. By using the theory of EMD and the multiloop analysis method, the stator current signal of aircraft generator was analyzed in this paper. The features of instantaneous frequency and amplitude were extracted. The time of fault was recorded. The simulation results showed that EMD can detect the internal stator winding fault.