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This paper presents a survey on the field of Augmented Reality, which combines virtual computer-generated material with the surrounding physical world, registers real and virtual object with each other and runs interactively at real time. Augmented Reality makes use of video display device to present the situation after the fusion of virtual and reality to the user, thus greatly improving the human visual experience. Augmented Reality technology is a new technology which is produced in recent years with the development of virtual reality technology. Augmented Reality research encompasses a large number of areas in computer science. With the development tracking technology, the image quality and the rapid development technology have become a new requirement. The paper introduces the primary content and state of art in this field. The key technologies, including basic tracking methods, display devices and registration processes, are discussed. Many typical AR applications and developing tools are listed. Finally, the paper describes different AR application.