The special theory of relativity, a theory of space and time founded by Einstein, is a development to Newton's system. The establishment of Specail Relativity is a great promotion to physics. It also get involved in Quantum Mechanics, became a necessary theory to study high-spead particles and have led to great achivement. The special theory of relativity, a theory of space and time founded by Einstein, is a development to Newton's system. The establishment of Specail Relativity is a great promotion to physics. It also get involved in Quantum Mechanics, became a necessary theory to study high-spead particles and have led to great achivement.