Recently a concept called BIM(Building Information Modeling) has been largely applied to construction industry throughout the life cycle of buildings from the design phase through to the maintenance phase. In addition, BIM-based large-scale public projects has been increased with the beginning of the Yongin Citizen Sports Park Project in 2008. Also from 2012 BIM-based design obligation has been actively introduced at national level in case of construction projects which total construction expense costs over 50 billion won. Accordingly individual architectural firms have focused on adopting BIM and performing BIM-based projects. BIM is not just a modeling program and it should be approached in terms of changes in Work Environment by architectural design firms. However, many of them have not realized the fact. Thus this study has conducted interviews with professionals after analysing previous studies and deducted factors and indicators for establishing BIM-based work environment of architectural design firms. And it has developed an evaluation model based on the calculation of weights of these indicators that resulted from a hierarchical analysis (Analytic Hierarchy Process: AHP).