This section first for smart snatched the classification of the common data accurately，study and analysis of the current car data safety of the legislative status quo of the United States，the European Union and Japan and other countries，with the domestic legislation present situation，because the domestic intelligent snatched the car starts late，the legislative advantages of studying abroad to perfect data security legal system. The research found that the current challenges and problems of data compliance of connected vehicles in some typical scenarios，including in-vehicle data protection and user privacy leakage and other security issues. In order to enhance the data security protection of connected vehicles，the security threats in common scenarios，such as data theft and data tampering，are identified. Formulate and design the technology and security scheme to solve the problem，formulate the corresponding data security protection measures，such as data encryption，data signature and secure transmission. Finally，we clarify the specific application of data security in practice，including data cross-border，data identification and supervision，data security evaluation and review，etc..