Ocean freight is the most widely used means of transportation in international trade．As the most efficient form. in terms of energy，ocean freight has its attractions in delivering large quantities of goods over long distances．Compared with ocean freight，airfreight enjoys the most obvious advantage in the speed of delivery, Another benefit of air transport·-greater security helps to reduce insurance premium since the risk of pilferage and damage is much smaller．With the development of international trade，air traffic has been developing rapidly．