Abstract: Optoelectronic oscillator is a microwave photon resonance system that can stably generate self-excited oscillations, and has been widely studied in recent years. This article reviews some of the research progress and important applications of optoelectronic oscillator since its inception. This article focuses on the research status of integrated optoelectronic oscillators in recent years and proposes a new type of electro-optical crystal material that can be applied to integrated optoelectronic oscillators.