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This paper analyzes the basic interaction tasks of three-dimensional interface on mobile terminal,which include virtual navigation and object selection.Virtual navigation means exploration in the virtual scene,which can use three kinds of Interactive method: touch-screen & three position key,operating mobile devices using mobile phones gyroscope,voice commands.Object selection can be decomposed into selection-manipulation-release.There are two ways to select objects of virtual hand and 3D widgets.It also describes the limitations of two-dimensional graphical interface on mobile terminal and the advantages of three-dimensional interface.Creating three-dimensional scene,designers should take into account the characteristics of three-dimensional interface,but also pay attention to the device itself and the specific use cases.The Interaction of three-dimensional interface increases the mobile-friendly of application,which can be applied to many fields.