With the rapid development of Intelligent and Connected Vehicles technology, all kinds of cybersecurity risks and problems of intelligent connected vehicles are followed. Systematic protection measures of multiple dimensions are proposed for the main security risks in this scenario. Based on intelligent made car multidimensional cybersecurity defense concept, in-depth analysis of intelligent made car networking security threats and risks, to "risk assessment -cybersecurity protection -test evaluation" as the core, to study and put forward a set of "cloud -communication link -car end" technology protection system is an organic whole, and to test the vehicle key elements, guiding the enterprise application.