This paper proposes an interactive augmented reality (AR) architecture for online computer supported collaborative work (CSCW). Current CSCW applications for AR are focused on multiple users met together to collaborate on the same physical environment. The proposed architecture can provide collaboration through computer network without the need of face-to-face communication. System architecture and operation scenario are firstly constructed. AR applications for machine assembly trainingis studied. The proposed interactive AR system architecture can provide new experiences for users and both the effectiveness and efficiency for online training applications can be significantly improved.