Air, sea, international express, International logistics is also called global logistics, refers to the production and consumption in two or more than two independent of the state, in order to overcome the space distance and time distance between production and consumption, to physical movement of goods to an international commodity trading or communication activities, so as to complete the final purpose of the international commodity trading, the seller's delivery of documents, and payment of goods; The terms of trade in which the buyer accepts documents, pays for goods and receives goods.