Abstract: This paper takes closed-loop building life cycle as bases to discuss the possibility and direction of utilizing as-built data and quantifying BIM data, so that BIM projects of different scales and composition could be cross-compared in function, category, usage condition and so on. Cloud-based computing is an effective way to establish and proceed such multi-layered and process-demanding tasks. The use of cloud-based computing with BIM is also studied. With cross-comparison of BIM projects, evidence-based design and construction would be plausible and BIM as-built data would be better attended.