This paper investigates the allocation mechanisms in inbound logistics system consisting of single supplier，single manufacturer and multiple third party logistics providers． The aim is to compare profit sharing and cost allocation in two outsourcing modes，direct outsourcing and lead logistics partner ( LLP) ． Multiprincipal and multiagent models are applied to investigate the system and solution procedures are proposed． Comparing the profit of all parties，results reveal that the manufacturer can obtain more profits in LLP mode than direct outsourcing，and the extra profits are generated from specialized management of LLP． When LLP’s reserved utility is the same with direct sourcing mode，the extra profits contributed by LLP are deprived and allocated between the manufacturer and the supplier． When LLP increases its reserved utility，it can share the extra profits with the manufacturer，and its income is the same with direct outsourcing mode．