This research deals with a critical phenomenon spread in all Arabic sciences after it has been outside philosophical and logical studies. This phenomenon is called (Circle consequence). The study tackles the definition, purposes and position of this notion. The first section discusses the notion of (Circle) and its types. The second gives an argument about the conditions of its happening, defines it and offers the reasons for its happening. The third explains the forms which call for (Circle) and the ways of its occurrence in the writings of authors and grammarians. Finally, the research mentions the ways for preventing (Circle) and the techniques used by grammarians to overcome it. This supposed phenomenon in some grammatical phrases. This research can be considers a grammatical critical study tackles a phenomenon which leads to false definitions and reasons. It also aims at furnishing the learners of Arabic grammar with this problem , the way of (Circle) and how overcome it by using and accurate scientific technique.