Quantum field theory regards particles as fields, and generally does not discuss the internal composition and structure of electrons. Exploring the internal composition and structure of electrons does not conflict with quantum field theory that does not discuss the internal composition and structure of electrons. Quantum mechanics is greatly embellished by a hypothesis of "the internal composition, structure and motion of electrons"—the important equations of quantum mechanics are no longer written intuitively, but can be derived from rigorous logic. It can give a reasonable and non-contradictory classical rotation model for electron spin and atomic structure. The most attractive thing is that the classical planetary model of atoms can also be successfully applied to the calculation of the dissociation energies and bond lengths of hydrogen molecules, lithium molecules, and sodium molecules. For atomic and molecular calculations a mixture of wave dynamics methods and classical methods in the context of planetary models can be used. There are hundreds of successful application cases. Which in turn shows that the two methods are equivalent or compatible. It can promote human beings to re-understand the characteristics of micro-systems.