In order to extract partial discharge（PD）signals efficiently from the narrowband noise

a method of using the distinct Q-factor of PD signals and the periodic narrowband noise is put forward to suppress periodic narrowband noise in PD signals based on the resonance-based sparse signal decomposition method.A signal is decomposed efficiently into PD signals and the periodic narrowband noise with the help of the resonance-based sparse signal decomposition method.It can better suppress periodic narrowband noise and have a good ability of anti-random interference in the same time.The proceeding result signal from simulation experiments and field test proves its feasibility and effectiveness.