The disturbance power and energy based method is commonly used to locate the transient disturbances. When detecting the types of transient disturbance injecting energy into system， it gives theoretic wrong results. An improved method based on disturbance power and energy is presented to locate the transient disturbances. The improved method considers the initial values of both the disturbance power and disturbance voltage， which can locate the transient disturbances absorbing energy from system or injecting energy into system at the same time. Before classifying the transient disturbances， this method can locate the two kinds of transient disturbances correctly. Simulation results show that the improved method achieves the objective of locating the two kinds of transient disturbances correctly.