Existing theories of material structure and quantum field theory cannot describe the specific sources of fundamental particles. In quantum field theory, the generation of particles is the instantaneous transformation of the field, rather than the true creation of particles. It is necessary to explore the composition (or source) of the next level of elementary particles or fields. The material structure theory of "all fundamental particles mainly originate from photons" has great advantages in combining logic and fact. By utilizing this new theory of material structure, quantum theory, Bohr theory, and classical electromagnetic theory can be mixed to describe the same particle. Both this new theory of material structure and its application examples demonstrate that there is no longer a gap between the micro world and the macro world in calculating the spin angular momentum of basic particles, atomic ionization energy, and molecular dissociation energy.