The East Asian upper-tropospheric jet is an important component of the East Asian summer monsoon and severely affects weather and climate in East Asia. During the past decade, various observational and numerical studies were conducted on variability in this jet and its effects on the East Asian climate. This paper reviews these studies mainly from the aspects of the features of the East Asian upper-tropospheric jet variability, the relationship between the jet and the East Asian climate, the possible mechanisms for jet variability, the evaluation of current climate models’ ability in simulating the jet, and projections of future changes in the jet.