A hinge assembly is provided. The hinge assembly includes a first base, a second base, a flexible connection element, and a number of hinge elements. The flexible connection element is located between and coupled to the first base and the second base. The hinge elements are arranged in a line and located between the first base and the second base. Each of the hinge elements comprises an interior portion and an exterior portion opposite to the interior portion. The exterior portions of the hinge elements are coupled to the flexible connection element. The interior portions of the hinge elements are capable of being either close to or far away from each other by rotating the first base with respect to the second base. A foldable mobile terminal and a rotation mechanism are also provided.