Abstract: Fiber integrated optics and discrete optics are expected to become a new branch of photonics integration. This technology can easily control and manipulate light waves in an optical fiber by a discrete method, and thus provides a flexible and convenient platform for research on integrated optics and discrete optics, and for the fabrication of micro-photonics devices and systems. This paper briefly summarizes the main ideas and key technologies of optical device integration and micro-optical system integration in optical fiber, discusses some vital issues of discrete optics, and provides a preliminary research basis for further developments in this direction.