Abstract: Einstein＇s great contribution in setting up the special relativity is introduced. The special relativity departs from classical physics through the postulate of the constancy of the velocity of light in empty space. Einstein is the first one who proposes the ＂principle of the constancy of the velocity of light＂ , and he is also the first person who recognizes that ＂relativity of simultaneity＂ and meanwhile abandons the concept of Aether. Einstein is the sole founder of the theory of special relativity.

Key words: Einstein, special relativity, Aether, principle of relativity, the principle of the constancy of the velocity of light