Curtain wall is a special discipline in AEC industries, The entire life cycle implementation of BIM is going to be a milestone during the innovative development of building curtain wall, especially in the construction of complex curtain wall. This paper has explored the difficulties of BIM-based forward design in many building curtain wall projects, studied the methodologies and processes of BIM-based forward design in current environment, and finally present the implementation process of BIM-based forward design of curtain wall through real cases.