Nowadays embedded system, hardware/software technology has progressed prosperously. In many field of industrial manufacture and people life, embedded system is indispensable. Recently hardware of embedded system becomes more powerful and sophisticated. SOC is an important trend for hardware design. New software architecture has to be proposed to adapt to this progress. In this paper, new software architecture for embedded system is proposed and described. KEY WORDS Embedded system, architecture, power-efficient, realtime, chip, SOC