Results of Special Relativity Theory can be derived out from Quantum Mechanics. Quantum Mechanics is independent integrated theory. There exist a new physics view. Real physical world is 5-dimensional space-time. Human world is 4-dimensional space-time,it’s only the projection of real physics world. Quantum Mechanical 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,all the particles speed is the light speed c. That is reason that the light speed c is very special. Coordinates transformation in 5-dimensional space-time,can derive out Lorentz transformation. In 5-dimensional space-time,space is relative,but time is absolute. In 5-dimensional space-time,there only exist space expansion or space contraction,not exist time expansion or time contraction. The new 5-dimensional space-time theory,not only is consistent with space-time system of Special Relativity Theory,but also 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.