In this paper, the absolute static reference frame of the universe is established, Galileo's relativity principle and the essence of light are analyzed, and the zero result of Michelson-Morey experiment is re-recognized. The conclusion is that the light in two directions reaches the eyepiece at the same time, and when the interferometer is rotated at any angle, the light in two directions still reaches the eyepiece at the same time, and the interference fringes will not move, so the zero result of the experiment is inevitable. This paper analyzes Lorenz's explanation of the zero result of Michelson-Morey experiment, and points out many contradictions and mistakes in it. Because Michelson's wrong calculation result is not consistent with the zero result of the experiment, Lorenz had to set up "length shortening", "clock slowing down" and a Lorenz transformation factor to piece together the zero result of the experiment. It is precisely because these assumptions are incorrect that all the relations and related theories that use Lorentz transformation factors are incorrect. Only Galileo's relativity principle can correctly explain the zero result of Michelson-Morey experiment, and galilean transformation is the theory that correctly describes motion. This paper also re-understands the relationship between matter, space, time and motion, inertia, field, field wave, force and energy, analyzes the essence of nuclear energy, and establishes a new model of the universe. It makes physics return to the correct track of classical theory and deepens and develops classical theory.