In recent years, Interoperability between Building Information Modeling (BIM) and Geographic Information System (GIS) model brings a strong demand in different domains. A number of researches and tools have been developed to integrate these two fields. Two most prominent standardized data models in BIM and GIS are IFC and CityGML. The conversion from IFC to CityGML in geometric and semantic perspective lay the foundation for the integration of BIM and GIS. This paper proposed a method for filtering of IFC objects and a rule for semantic mapping from IFC to CityGML and the experiments demonstrate the feasibility of the proposed method.