The element capacities, disposal capability and flux, which are crucial ingredients at tran-loading facility nodes in supply chain were studied theoretically. A theoretical model was developed by queuing theory.  The disposal capability and flux at tran-loading facility nodes was optimized and the profit was maximized.  The finding offers a base for the route capacity and capacities matching of supply chain logistics capability.  This conclusion is also profound instruction for confirming the disposal capability and the flux of firms.