Express delivery, also known as express delivery or express transportation, refers to a new mode of transportation in which logistics enterprises (including freight forwarders) quickly and safely deliver the documents or packages entrusted by users from the sender to the recipient's door-to-door (hand-in-hand) through their own independent network or through joint cooperation (i.e. Networking). Express can be divided into broad sense and narrow sense. Express delivery in a broad sense refers to the express delivery of any goods (including bulk shipments); In the narrow sense, express refers to the emergency delivery service of business documents and small pieces. From the standard of service, express delivery generally refers to the express delivery service completed within 48 hours. From the definition of express, the following three characteristics of express can be summarized: From the perspective of economic category, express is a branch of logistics industry, and the research of express belongs to the category of logistics. From the perspective of business operation, express delivery is a new mode of transportation and an important link in the supply chain. From the nature of operation, express is a new service trade with high added value. In January 2018, these ten express companies, including EMS, SF, Zhongtong, Shentong, Yuantong, Yunda, Baishi, Debang, Jingdong Logistics and Suning logistics, said that they would not close during the Spring Festival.