Abstract Dirac, Wheeler Feynman, and Cramer proposed the electromagnetic theory idea of current element generating half retarded wave and half advanced wave. The author further refined this idea. Proposed the laws of mutual energy flow and conservation of energy. And thus established a new set of electromagnetic theories. For calculating electromagnetic wave radiation of current elements, Maxwell's electromagnetic theory requires electromagnetic radiation to meet the boundary conditions of Sliver Muller. In the author's new theory, this boundary condition is replaced by the charge of the absorber covering the infinite sphere. The author assumes that these absorbers are sinks and will generate advanced waves. The radiation of the current element is a retarded wave. This retarded wave and advanced wave form a mutual energy flow. The author believes that these mutual energy flows are photons. The sum of the energy of countless photons is the macroscopic electromagnetic radiation of the current element. This radiation should be consistent with the Poynting energy flow in classical electromagnetic theory. If the two are indeed consistent, it indicates that the two theories of electromagnetic radiation are equivalent. The author proves that the two theories are indeed equivalent. In this proof, the author also addresses an inherent loophole in Poynting's theorem. In addition, the author found that due to the introduction of sinks, both the field and potential must be compressed to the original %50. This corresponds precisely to the current generating either a %50 retarded wave or a %50 advanced wave. In this way, the author's electromagnetic theory can be seen as the lower level electromagnetic theory of Maxwell's electromagnetic theory. This macroscopic electromagnetic wave is composed of countless photons. Photons are mutual energy flows, which are composed of retarded waves emitted by the sources and advanced waves emitted by the sinks.