The micro-ejection phenomenon and its internal mechanism analysis of metal materials under intense laser shock are the frontier issues in the field of shock compression science and engineering. Related research is of great significance for understanding the dynamic behavior of materials under extreme loading conditions. With the continuous development of laser technology, scientists at home and abroad have carried out numerous micro-ejection diagnostic experiments based on some large laser devices in various countries in recent years, and made a series of significant progress in the properties of ejection, the growth of instability at the metal interface and the mixing mechanism of ejection. By reviewing the research history of ejecta static and dynamic diagnostic experiments, this paper describes the main mechanism of ejection, influencing factors and ejecta interface mixing mechanism in detail, and then it reviews, classifies and summarizes the important applications of micro-ejection experimental diagnostic methods. Finally, according to the current development trend of ejecta diagnostic experiments at home and abroad, the deficiencies in the current ejection experimental research results are summarized, and the future development direction of ejection experimental research is prospected.