Since the rising of intentionality, it is almost throughout the development of the phenomenological movement, which becomes the core of the epistemological philosophy theory and is unable to avoid. The intentionality concept was put forward by Franz Brentano, then was criticized and transformed by Husserl, Heidegger and Sartre. Therefore, its connotation had much profound changes. This paper tries to analyze these changes and clarify the sigintentional concept tentional concept in the phenomenological philosophy.