In this paper, our purpose is extending 2D multi-touch interaction to 3D space and presenting a universal multi-touch gestures for 3D space. We described a system that allows people to use their familiar multi-touch gestures in 3D space without touching surface. We called these midair gestures in 3D as 3D multi-touch-like gestures. There is no object or surface for user to touch in 3D space, so we use depth camera to detect ringers' state and estimate whether finger in the "click down" or "click up", which show user's intention to interact with system. We use machine learning to recognize hand shapes. While we do not need to precessing the recognition all the time, we only recognize hand shape between "click down" or "click up".
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