Comprehensive foreign trade service enterprise (external integrated supply chain) is a new form of foreign trade service emerging in recent years. It mainly provides a complete set of foreign trade related services such as customs declaration and inspection, logistics, tax refund, settlement, credit insurance, certificate of origin, and foreign exchange collection to small and medium-sized production enterprises. Through innovative business models, the use of the Internet, big data, for small and medium-sized enterprises to explore the international market, reduce trade costs, alleviate financing difficulties, etc.