The technologically system architecture of aircraft assembling process visualization is presented according to the development requirement of digital aircraft assembly. The key technologies is studied about the dynamic data associating form EBOM to PBOM, simulatiing and optimizing assembling process based on DELMIA, and lightening the 3D models, which are the technological foundation to implementation of building the assembly resource database, designing the assembly process planning, visualizing assembling process and informations. The visualization system for aircraft assembly simulation is developed and built based on C/S networked mode, which could be applied in aircraft assembly workshop. The system platform is industrially test taken the forward cargo door of one civil aircraft for example, it is proved that this visualization system could be applied in aircraft assembly field as guidance of assembling production, the accuracy and the efficiency of parts and components' assembly are improved distinctly.