Abstract: Flotation has the advantages of high separation efficiency and wide application range. The induction time refers to the time required for bubble and particle from collision to adhesion, which plays a crucial role in the flotation process. In general, the shorter the induction time, the easier the adhesion between bubble and particle, and the better the floatability of minerals. The definition, testing methods, and development of testing techniques of induction time were introduced, and the research progress of influencing factors of induction time (including bubble characteristics, particle properties and solution environment) in recent years was systematically analyzed. Through comprehensive analysis, it is believed that the induction time is an important parameter that affects the flotation efficiency. Measures such as optimizing the surface characteristics of mineral particles and flotation solution conditions can be taken to shorten the bubble-particle induction time, so as to improve the flotation recovery of minerals.