Abstract: Along with the needs of development of underground space, engineering of foundation pit, which is the technical support for underground development, is facing new challenges. This arlicle reviews the characteristics as well as design scheme of shallow foundation pit projects in Beijing area and analyzes tile features and challenges of urban oversized deep foundation pit projects. Combined with design, construction practice, monitoring as well as evaluation of an oversized deep foundation pit project in Beijing, the design concept of oversized deep foundation pit project is summarized and new ideas for development of foundation pit in Beijing area are raised.