Abstract: The technology of optic-electronic oscillator(OEO), characterized by low noise, high frequency stability and anti-electromagnetic interference ability, is a research hotspot in microwave photonics, which breaks through the limitation of microwave signal suchac frequency, improves the stability of signal and the big noise based on the electronic technology.The technologies of optic-electronic oscillator, such as the theory, theoretical models and the implementation method, etc and its application are researched. Key technologies and solutions to be used in microwave signal processing system are proposed, such as multi-pass noise reduction, temperature and stress-compensation of optical fiber and optoelectronic integration, which are urgently in need of breakthrough.