The Fagus Factory at Alfeld on the Leine in Germany, which was built in 1911 and 1914, is a well-known and very important object in the history of modern architecture. Alan Colquhoun mentioned that it is "prophetic of the 'objective' (sachlich) Modern Movement of the 1920s". Vittrio M. Lampugnani evaluated it as "a Pioneer building of the architectural Realism". Most of historian of architecture explain that these achievements were accomplished mainly by the master architect Walter Gropius and sometimes by his co-worker Adolf Meyer. Through investigating the background in the planning stage and the process of design it is to try to find out what is truly happened during the project time. Furthermore, historical meanings of the building in the modern architecture is reinterpreted in the following aspects; who or which elements have influence on the Fagus Factory? and what kind of problems can be caused by the digested architectural history?