Science and Education Publishing International Journal of Physics 2333-4576 4 5 2016 8 13 A New Equivalent Theory with Special Relativity Theory, Particle Wave in 5-dimensional Space-time 123 129 EN Xiao Lin Li Chongqing, China IJP2016452 10.12691/ijp-4-5-2 2016 5 3 2016 6 21 2016 8 11 There exist a new physics model. Real physical world is 5-dimensional space-time. Human world is 4-dimensional space-time. Human world just is the projection of real physics world. Particle wave is present in 5-dimensional space-time. So we can derive out Mass-energy equation. So we can derive out all results of Special Relativity Theory. In 5-dimensional space-time, speed of all particles is the light speed c. It is reason that the light speed c is very special. Coordinates transformation in 5-dimensional space-time, can derive out Lorentz transformation. The new physics model theory is a equivalent theory with Special Relativity Theory. In 5-dimensional space-time, there only exist space expansion or space contraction. In 5-dimensional space-time, there not exist time expansion or time contraction, time is absolute. In 5-dimensional space-time, particle rest mass only is particle movement portions at 4th dimensional space. The new 5-dimensional space-time theory, is consistent with space-time system of Special Relativity Theory, and it can transition to space-time system in Lorentz symmetry breaking smoonthly. The new 5-dimensional space-time theory has more wide range adaptation than Special Relativity Theory.