There are two essential meanings of the word ‘you’, one ispossession, the other is existence. These are the originalmeanings used in various grammatical structures of which adaptthe word you.
The evolution of language theory is based on the variation,selection, regeneration and duplication. you is also reanalaysisand analogy.
This study intended to review the diachronic and synchronicchanging procedure of you. we analysed from Qin and HanDynasties to contemporary Chinese language, to reach thefollowing 3 conclusions. (1) essential meanings of the word youevolvement into the comparing mark, (2) essential meanings ofthe word you evolvement into mark of nominal elements,(3)essential meanings of the word you evolvement into the markof the perfect aspect.