Abstract: A novel augmented interaction technique is proposed using the mixture of virtual reality and actual reality,augmenting information and constraining proxy.It is able to improve substancially interacting efficiency of virtual assembly environment.The mixture of virtual reality and actual reality inherits all interaction of virtual reality,and also provides additional scenes of the real assembly to enrich the perception of assembly process.Augmented information provides users assembly instruction as detailed description and features to direct assembly operations.Constrained proxy and its matching rules ensure visual restriction relationship reconstruction,and avoid complex calculation of part constraint's matching.The augmented human-computer interaction technique provides a convenient interaction means for the application of virtual assembly.Finally,the mechanism of virtual assembly platform is introduced,and an example is used to demonstrate the process of virtual assembly system.