The purpose of this study is to suggest development direction of open BIM. To achieve this purpose, the authors have investigated application status and current problems of open BIM through question survey to design firm which is introducing or plan BIM. In addition, the authors have suggested improvement way about current problems of BIM application such as BIM standard guide, reference of practical application examples, BIM library, data interoperability between software, improvement of BIM software function and performance that is deducted through question survey.