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Transient power quality problems is the salient problem in today's power quality problems. And its detection is the precondition of monitoring and restraining. Wavelet package transform with better time frequency resolution is developed on the wavelet transform. The signal is decomposed on the wavelet package plane and the characteristic weights of signal can be achieved using available information. Through to the transient signal of voltage sag, the voltage swell, voltage interrupt, transient oscillation for analysis results show that wavelet package transform is also useful in analyzing the transient power quality.