With the continuous development of 5G communication，internet of vehicle（IoV），the technical route of autonomous driving（AD）has gradually changed from single vehicle intelligent to intelligent connected vehicle. As the key technology of information interaction in intelligent connected vehicle，c-v2x technology plays an important role in the evolution and development of AD. Under this background，this report first analysised the important significance of intelligent connected communication technology in the aspects of technology supplement，cost control and benefit improvement. Based on the analysis of the policy orientation，technology and standard development and application progress over the world，it is considered that the IoV technology is converging with the single vehicle intelligent technology，and gradually forms a development trend of vehicle-to-vehicle，vehicle-to-road oriented AD intelligent network technology. When a large number of traffic travelers participate in traffic and other unknown scenarios at the same time，the IoV technology is facing the challenge that it is difficult to meet the needs of AD in terms of delay，reliability and bandwidth. In the future，it is necessary to strengthen the coordination and cooperation among automobile，communication，transportation，electronics and etc.，combine the IoV technology with various industry systems，and carry out the connected vehicle test demonstration in stages，steps and scenarios，so as to realize the iterative evolution and commercial landing of IoV technology.