Automobiles are rapidly developing in the direction of electrification, intelligence, and networking, and they are also facing severe information security challenges. The safety of automotive information systems cannot be solved by a single technical solution. It is necessary to implement a multi-integrated security solution to fully protect the overall security of the vehicle from different dimensions and levels such as the underlying security operating system, operating system protection, application layer protection, and security management. The wide application of TEE on the mobile phone has proved its effectiveness and practicability in system security protection. Register ACSS 2019 Now to learn how to build a multi-level car network system security architecture based on TEE.