BIM technology is changing traditional architect design, construction management and operation works suliminally. Today BIM technologies have been heavily adopted in design and construction phases, and gained tremendously in economic return. However, the value of BIM technologies are far beyond, it also creates huge value in operation phase. This article is to analyze BIM based space and facility management system, to find a solution for adopting BIM in building operation management phase. The purpose is to achieve breakthrough impact in efficiency, safety, comfort, and economy in operation phase.