To meet the demand for rapid development of intelligent cockpit software in intelligent connected cars, this paper proposes a convenient and reliable development approach. This approach, through the unified definition of interface standards, effectively separates the OTA main control program from vehicle interaction information and user interaction information, thereby promoting the platformization and standardization of OTA UE module core code. In this mode, for the development of different vehicle models, only the IVI (In-Vehicle Infotainment System) needs to implement the vehicle interfaces and interaction interfaces defined by UE, and the UE module code can be reused without the need for repetitive development and debugging work. This improvement not only enhances the stability and reliability of UE code but also significantly increases development efficiency, providing strong support for the rapid development of the intelligent connected car industry.