The latest somatosensory device Leap Motion detects dynamic gesture to provide users a new experience, such as the somatosensory games, virtual playing, volley painting and other non-contact human-computer interaction. Firstly, this paper focuses on the technology characteristics of Leap Motion and compares with another similar device, then introduces some applications based on Leap Motion and prospects for development. This paper analyzes the theory and technology of Leap Motion, and defines the gesture control technology based on Leap Motion. Finally, this paper gives a specific example of gesture control virtual objects in the scene movement based on Unity 3D, which makes a detail introduction about the implementation of gesture control techniques using Leap Motion.