The transport junction takes kinds of transport mode as an integration, which completes the cargo and the passenger transportation. Since the transport junction enhances the scope of logistics service and the customer universality, reduces cost for the logistics enterprise to gain the public infrastructure and the information facility, therefore, has the inevitable influence to the potential market demand of logistics. This article establishes the market demand potential function of logistics, makes four conclusions by sensitive analysis. First, the market potential of logistics is decided by the logistics transaction efficiency. Second, the market potential of logistics is decided by the labor level division of logistics and society. Third, the market potential of logistics is decided by the network degree of logistics, particularly, important transport junction. Fourth, as the logistics cost is high, the transaction efficiency, the logistics demand, the labor level division and the network degree of logistics have more obvious influence to potential market demand of logistics.