Power quality transients can cause heavy loss to sensitive loads.By adopting multi-resolution analysis idea of wavelet transform,fractal theory was used to classify and analyze the power quality transients from the point of view of graphic pattern recognition.The simple box dimension was used for primary analysis,the waveform was segmented according to the distribution of the box,and the key segmentations containing transients were abstracted for further analysis through fractal and wavelet transform.The re...