  After J. C. Maxwell brought forward the concept of displacement currents, H.
R. Hertz and other scholars verified the existence of electromagnetic waves in
experimental, and then confirmed indirectly the conceptive correctness of
displacement currents. During the recent years, along with the evolution of
electronic measurement technologies, the researchers are attempting to validate
directly the amplitude and orientation of displacement currents in
experimental. The paper proposes and achieves one phase measurement experiment
to scrutinize the orientation of displacement currents. The study indicates
that the existing measurement technology is capable of inspecting directly the
amplitude and orientation of displacement currents. The test results do not
locate on the predicted range of classical electromagnetic theory presently.
The displacement current may not be treatable similar to the conductive current
to a certain extent. This conclusion enriches the understanding to the property
of displacement currents.
