optoelectronic oscillator is widely used in radar, communication and measurement fields, and is a research hotspot in microwave photonics. The introduction of new concepts and technologies promotes the development of optoelectronic oscillator and further expands the application of optoelectronic oscillators in modern electronic systems. This paper introduces the new concepts and technologies in optoelectronic oscillator, including parity-time symmetric optoelectronic oscillator, Fourier domain mode-locking optoelectronic oscillator, parametric optoelectronic oscillator, and integrated optoelectronic oscillator, points out the future development direction of photoelectric oscillator.