Based on Augmented Reality

we developed a virtual assembly system using Tangible User Interface. In the condition of single camera

it connects real markers and virtual models of the components. Users control the virtual models by manipulating tangible markers to accomplish the assembly procedure. Compared to traditional virtual assembly

it improved the sense of reality during the operation. We designed four kinds of markers according to the demands of the assembly task. Three interaction techniques

including proximity

constraint information judgment and view control are proposed. Besides

we also used collision detection to realize accurate and natural virtual assembly. The system can help designers analyse and improve products

and it’s also easier for users to learn.