The origin of everything in the universe is one of the most fundamental questions in physics, the study of which is still inconclusive. This paper assumes that everything in the universe is made up of a fluid-like spacon, which is extremely tiny, has a very high speed and a certain momentum, and which makes up matter and space. The vacuum is an ideal fluid filled with spacons, and elementary particles are formed by the aggregation and vortex of spacons. Some particles are constantly vibrating at high speed, creating a constant expansion and contraction effect like a pulsating body, and in the vacuum ideal fluid the Coulomb and universal gravitation are formed through the remote interactions of hydrodynamic forces, thus a new explanation of the nature of charge and mass is given. The paper also deals with the structure and motion of electrons and photons, makes brief conjectures about the structure of other elementary particles, and concludes with some discussion of the structure of the universe and space-time.