With the comprehension of aesthetic consciousness, picture would be threatened with nihilism of art, that is, we can not really distinguish be-ing of art from that of equipment, and as a consequence art would be lost in non-art. To resolve this problem, frame should be re-considered as a requirement for the be-ing of picture again, With the transformation of medium, it follows from the self-presentation of picture that the picture world as an “occurrence” happens. Such picture world virtually represents the be-ing of beings involved in the picture, and what makes picture different from real life world is virtuality. But only in human's coming-into-understanding does the picture would be opened, therefore it is also by the coming-into-understanding that the distance between them world be reconciled, we call such reconciliation “the fusion of horizons”.