Because car OBD bus network, the design and implementation of for people’s travel and road traffic safety is of great importance, so this paper is aimed at a car network design and implementation model of OBD, vehicle CAN bus information provided by the OBD diagnostic port for car networking information sources, mainly focuses on the information interconnection between cars and people.First of all, from the OBD car networking hardware circuit design and implementation and OBD networking software design and implementation of two aspects.Finally, the whole system integration and system function test.After OBD car networking offline and online testing of the experimental results show that the system has high precision, stable performance characteristics, can the current car quickly and information feedback to the user through the OBD diagnostic port, realizes the person and the vehicle information interconnection.