OSEK/VDX is the common software interface in the area of automotive electronics. It is necessary to build a real time operating system in order to achieve the real time control of hybrid electric vehicle control system. Real-time operating system can improve the response rate of control system and is easy to implement design modularity. The structure of HEV system, hardware of system and embedded software design were introduced. Design of real-time operating system kernel and methods of task were divided base on the data flow and main state machine, and CAN communication program was presented. A real-time operating system has been built based on the interface OSEK/VDX.