In order to analyze Doubly-fed Induction Generator (DFIG) electromagnetic property accurately when multiple faults happen and provide method and data to failure prediction, structure optimization and protection, this paper proposes an analytical method used for multiple short-circuit fault at multiple working conditions. The generator entire area model is set up by finite element method (FEM), electromagnetic field is calculated, and flux density distribution frequency spectrum is obtained by dealing with programmed data and FFT decomposition. 1.5 MW generator is modeled by this method, and the electromagnetic fields of sub-synchronous, super-synchronous and normal synchronization state and typical stator turn-to-turn and single-phase short-circuit fault are calculated and contrasted. Results of simulation manifest that this method can distinguish multiple short-circuit faults from the normal operation state according to waveforms of flux density nephogram and the characteristic quantity in frequency spectrum such as higher harmonic component.