This study employs trend model to investigate various modes of coordination among team members of steel construction. According to the project network developed based on the characteristics of a project, the trend model establishes an activity relationship matrix. to identify the activity relationships within the construction process. Then Delphi technique is used to determine optimal number of level of an organization. To evaluate various organizational structures and their coordination efficiencies, this study utilizes the analytical hierarchy process to quantify the strength of an organizational structure and identify the optimal structure for steel construction.