Based on the background that 32 bit embedded systems chip， especially system-on-chip combined with ARM9 processor technology has become main trend of the industrial application， the structure and function of power energy information acquisition system is analyzed， and then the hardware of concentrator based on embedded system-on-chip AT91RM9200 is designed. Its core circuit mainly includes high-capacity storage systems and a variety of communication process. Compared with 32 bit chips usually designed for industrial applications， an additional watchdog circuit is added in order to guarantee long-term stable and reliable operation of the equipment in complex electromagnetic industrial environment. This application design provides a typical reference hardware platform for embedded technology widely used in power system.