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In three-phase electrical power system, in order to compensate and control the harmonic current and the reactive power more effectively, this paper proposed an electric current testing method which is based on the method of FBD. This method can be used to detecting the fundamental wavepsilas negative sequence current, the fundamental wavepsilas zero-sequence current, the harmonic current and so on. The FBD method, compared with the other electric current testing method based on the instant reactive power theory, is more useful in the same situation. The result of PSCAD simulation has indicated the validity and the accuracy of this electric current testing method.