The automobile chain is an ecological chain that connects the services of various industries in the automobile aftermarket. Relying on the vehicle OBD interface data, the automobile chain standardizes the basic information of the vehicle, vehicle condition data, driving data, maintenance, insurance records, etc. The value conversion after the chain creates the value of "driving 1 kilometer, rewarding 1 point, and worth 1 cent" for car owners; at the same time, it creates additional value-added services for Internet of Vehicles operations and automotive aftermarket service providers. Blockchain + artificial intelligence and big data technology will provide traffic management departments with traffic condition prediction and smart city management.