Considering the characteristics of airborne embedded systems,such as high real-time requirements,limited hardware resources and weak data and task security protection,this paper studies TEE-based airborne embedded data security technology.The object of security protection reinforcement is the three stages in the whole life cycle of data in airborne embedded systems,namely,data storage,data transmission and data use.Based on the unique data isolation feature of TEE environment,the encryption algorithm in data storage,the signature checking procedure in data transmission,the sensitive data and applications in data use are isolated from the general execution environment,which ensures the safe and reliable processing of key data between different tasks,and the encryption algorithm used in it is simplified,ensuring better real-time performance under the premise of limited hardware resources.The simulation results show that compared with the previous methods,the proposed algorithm has better safety,reliability and efficiency.