A graphical tool, IDEF0, which is an international information standard, was introduced in this paper to assist construction project planning. Traditional planning tools including blue print, CPM, and bar chart are incompetent to manage the information contained in the very complex construction project. By the advancement of current information technology, managers can fulfill their plan in a much more effective way. The definition of management was reviewed, then the usage of IDEF0 was introduced. Finally, traditional flow chart was compared with the IDEF0 technique by the case of constructing the underground diaphragm wall and a conclusion was made.