Two dimensional(2D)materials are widely used in communication,infrared detection,aerospace and biomedical due to their ultrathin thickness,high mechanical flexibility,tunable band gap and easily tailored van der Waals heterostructures.Among them,2D Bi2O2Se is an emerging two dimensional material with unique crystal structure,excellent photoelectric characteristics and superior environmental stability,which is an excellent candidate material for preparing high performance infrared optoelectronic devices.In this paper,the research progress of 2D Bi2O2Se is reviewed.Firstly,the crystal structure and energy band structure of 2D Bi2O2Se and its photoelectric properties are introduced.Then,the common preparation methods of Bi2O2Se materials,including chemical vapor deposition and hydrothermal synthesis,are described in detail.In addition,the current status of applications of 2D Bi2O2Se materials in field effect transistors,photo detectors and optical switches are described.Finally,the paper is concluded and an outlook on the development of Bi2O2Se materials is provided.