We present a 3D origami simulator with multi-touch interaction. This is a preliminary exploration of manipulating 3D models with multi-touch. Following a user centered approach, we analyzed how people make paper origami models and mapped the common actions into two-touch gestures. The user study suggested that people enjoyed the simulator and think the techniques can be applied to other 3D modeling environments. Keywords Multi-touch interaction, 3D manipulation. ACM Classification Keywords H.5.2 User Interfaces: Input devices and strategies, Interaction styles