Abstract: As there is an increasing demand for mobile officing, trans-regional and cross-unit cooperation, building collaborative design is bound to expand from small scale local area network to wide area network. Undoubtedly, a more open environment puts forwards a higher requirement for the security and applicability. As a result, this paper discusses two key technologies on building collaborative design platform in wide area network-User Login Security and Collaborative Framework. On one hand, the author analyzes and compares current popular user login security modes such as domain logon, single sign-on, fingerprint identification and USBKEY from the technical to application level. On the other hand, the author discusses the structure of the framework on building collaborative design platform and makes a feasibility analysis on the technology involved, like remote control. Finally, integrating the trend of information technology development, the author provides a present solution and a future solution of building collaborative design platform in the wide area network.