Combined with the principle of mutual energy of electromagnetic field, mutual energy theorem, mutual energy flow theorem and Wheeler - Feynman absorption theory, we propose a mutual energy flow interpretation for quantum mechanics. The Wheeler-Feynman absorber theory suggests that the light wave is composed of both the advanced and the retarded waves. John Cramer gave a simple model of photon with plane waves. The author put forward the mutual energy theorem and the principle of mutual energy. The principle of mutual energy is a formula which removes the remainder of the self-energy terms from the Poynting theorem. The principle of mutual energy as the electromagnetic field axiom can ensure that the classic electromagnetic theory building does not fall to overcome the many difficulties if the Maxwell equations have been applied as axioms. From the principle of mutual energy, radio waves, light waves are all consists of the retarded wave of the emitters and the advanced wave of the absorber. The retarded wave and the advanced wave are not simply superimposed, but combined very close together into one. The retarded wave and the advanced wave constitute the mutual energy flow. The energy flows from the emitter to the absorber in the form of energy flow. The integral of the flux of the energy flow to time is constant on any surface between the emitter and the absorber, which is the energy of the photon. Photon is nothing else, it is just the mutual energy flow. In this paper, we should further clarify that the mutual energy flow theorem tells us that the waves in the space are much like the waves in the waveguide as a quasi-plane wave. Although this quasi-plane wave is composed of the retarded wave of the emitter and the advanced wave of the absorber, we can also think of it as a purely retarded wave. The vacuum space naturally constitutes the waveguide of the mutual energy flow. Since the field between the charge and the other charge can be regarded as a plane wave, it naturally avoids the problem of self-energy divergence. Recently, Afshar experiments supported the John Cramer transactional interpretation. We found that, this experiment can also be explained by using the principle of mutual energy flow. Hence, Afshar experiment also supports the author's mutual energy flow interpretation. To make our theory self-consistent, we also introduced the principle of the return of the self-energy flow.

Mutual Energy, Poynting, Maxwell, Advance Wave, Absorber Theory, Transactional Interpretation, Photon, Probability