Abstract: A construction supply chain consisting of multi-suppliers and one main contractor is considered, in the context of constrained building material space. How multi uncertain suppliers horizontally synchronized supply to reduce the main contractor’s expected total cost is identified. Through information sharing among supply chain, multi-suppliers horizontally synchronized basic model is presented. Then through capacity outsourcing or expediting, multi-suppliers horizontally synchronized advanced model is presented. Finally, the whole proceed of building material supply is simulated by Monte Carlo methodology. The result shows: compared with traditional supply model, these two synchronized model can decrease the main contractor’s expected total cost effectively. The basic model’s cost is minimum, and the advanced model can reduce the cost of construction duration delay. Pareto improvement of construction supply chain is achieved.

Key words: construction supply chain, horizontal synchronization, space-constrained, multi-suppliers