Abstract: The theory model of integrated construction supply chain management was constructed based on JIT with the supply chain theory and JIT theory from the study of the characteristic and present situation of prefabricated construction. Especially to Fabrication-Distribution-Construction stage, optimal order-supply model based on JIT was constructed. Compared with the traditional economic order quantity model, it deduced the applicable condition of parameter that can reduce the total cost of supply chain, reduce the order cost of contractor, improve the site condition and increase the profits of component vendor. Then it was verified by practical case. At last, the theory model of supply chain management was given based on a component vendor to multiple contractors by improving and optimizing of the single one-one supply chain, and the potential space that can be further optimized was also analyzed.