BIM is abbreviation of Building Information Modeling which converts  information from 2D CAD to 3D design and extracts Data Base from all related information during the architectural design. Also, we can see how the project goes each construction phase via 3D virtual model. Mooyoung A&E provides 3D modeling digital technology and service to bring the best quality of architectural design throughout the entire life-cycle of a building project from planning phase to design, construction and maintenance. Through BIM design, potential problems occurred during the design and construction phase are forecasted as well as shortening construction period, efficient managing construction, using as initial data for construction cost estimation and maintenance. Based on above, we are able to suggest optimist method to reduce the life-cycle cost of the building.