The concept of learner autonomy is well known as very complex as many scholars put emphasis on differences between his ideas and others’. That no consensus has reached so far puzzles us. However, a good understanding of autonomy is the basis of putting development of autonomy into practice. Through examining common features of different concepts and explaining the relationship between autonomy and its related concepts, the highly condensed qualities of "relativity" and "duality" are put forward and some implications about specific ways of fostering autonomy in Chinese educational context are also discussed.