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Without Embedded system's contribution, IT industry can hardly make current achievement. And Embedded system is always everywhere. Embedded system's family is too big, and cover different subjects and systems. So the proper understanding to its family members, history, concept system and trend has significant meaning to the "Smarter Planet". The article summarizes international and domestic related literatures, describes the system's structure, analyzes the facing challenges, discusses its relationship with relevant techniques, and at last, looks forward to the future of embedded system.