The viewpoint that Female Kingdom is Supi has been adopted by many scholars in the circle of Tibetan studies and has a great influence.Is it really the case? This paper has taken deep investigation into the locations and social conditions of Female Kingdom and Supi on which a detailed contrast between the two kingdoms,and then points out that the viewpoint that Female Kingdom is Supi can not prove to be true at all.It also clarifies two crucial pieces of historical recording about the origin of the idea that Female Kingdom is Supi——The last name of the Queen of the Female Kingdom is Supi and Female Kingdom lies to the west of Kingdom of Fu.The two items are insufficient to support the claim that Female Kingdom is Supi.