Order numbers for vehicles to freight were got by particle position vector , single vehicle route was got by aco , and then evaluated and filtered particales according to optimal vehicle routes , circulated until terminate qualification 由粒子群算法的粒子位置向量得到每辆车所需运送的订单号，用蚁群算法优化单车路径，根据优化的总路径评价和筛选粒子，直到满足终止条件。
Trade between the western and eastern regions is not balanced and the transportation modes for raw materials and consumer products are usually different . this pattern of trade poses additional challenges to freight forwarders and logistics services providers 西部与沿海地区之间的贸易并不平衡，原材料及消费品的运输方式亦不一样，这个贸易模式对货运代理及物流服务供应商都带来额外的挑战。
There are various ways to manage the activity of nvocc in different country , us code 46 part 515 specify the license , financial responsibility and general obligation of ocean transportation intermediary , which are divided into freight forward and nvocc , and there are great differences of the management to freight forward and novcc 其他国家和地区对于无船承运人的管理是不同的，美国联邦法典第46册515部分详细规定了远洋运输中介人的执照，财政责任要求和一般责任，远洋运输中介人又分为无船承运人和货运代理人。而对于同属于远洋运输中介人的无船承运人和货运代理人的管理是严格区别的。
