Abstract: Zizek gives the definition of the ideology with three kinds;the ideology of being-for-itself,the ideology of being-in-itself,and the ideology of being-for-itself and being-in-itself.The implication of the theory refers to the ideology is everything,or exist everywhere.The ideology is not only the social consciousness,but also the social existence.Thus,its realistic point is that we can't get rid of the ideology;instead,we must rely on the ideology.