Abstract: The network technology based on Internet and fault diagnosis technology of civil aeroengine are combined in this paper.It is believed that this approach can promote the maintenance and fault diagnosis methods to network environment.As a result,the capability and efficiency of the civil aeronautical maintenance system will be significantly improved.From the point of engineering application,several key technical problems are discussed.The technology status of fault diagnosis for civil aeroengine is analyzed first,and the architecture of remote fault diagnostic system for civil aeroengine is then demonstrated.An idea of improving diagnostic system network is presented that techniques of up down computer structure and Component Object Module (COM) are employed to realize remote operation,status monitoring and controlling.With COM and network database techniques,knowledge storage and inference are realized in web server.Two versatile Computer Supported Cooperate Work (CSCW) environments for remote fault diagnosis are developed,which are based on Labview/G Web Server and Datasocket technology of National Instrument (NI) respectively.