Abstract: According to non-stationary and burst capability of the transient power system disturbing signals, this paper analyzed the characteristics of Lifting Scheme Wavelet in detecting transient disturbing signals, proposed a method to detect and locate the transient power quality disturbances by db4 lifting wavelet transform. This method is used for detection and location in the MATLAB environment on the voltage swells, voltage sags, voltage interruption, frequency deviation, transient oscillation, transient pulse and other transient power quality disturbing signals, simulation results indicated that the method had a millisecond level accuracy and can be implemented precisely positioning on starting and ending time of the disturbance signals.