Heart disease is one of the important diseases that endanger human health,and its morbidity and mortality rate is on the rise.Ventricular assist device is an effective treatment for cardiac patients with severe cardiac insufficiency.The development of the ventricular assist device at home and abroad was reviewed.The technical characteristics of the first generation,the second generation and the third generation ventricular assist devices were analyzed.The bearing technology used in the ventricular assist device was discussed,in which the liquid suspension and magnetic suspension bearings were mainly discussed.Some key technologies of the ventricular assist device were summarized to provide reference for the study of the ventricular assist device.