Abstract:BIM technology property rights have the characteristics that value is not easy to be evaluated but easy to be infringed. Therefore, it is very important to accurately evaluate the value of BIM technology property rights and reasonably protect BIM technology property rights. By defining BIM technology property right and analyzing the characteristics of BIM technology, this paper puts forward a method, which is applicable to the value evaluation of BIM technology property right: weighting cost-benefit method, and the selection of specific parameters is discussed. The results show that the value evaluation method of BIM technology property right, which is established in this paper has certain rationality and validity through empirical research, and proposals of the protection of BIM technology property right are offered from five aspects, which involve system construction, technology improvement, law making, sharing platform building and strengthening the research on BIM technology property right.