Abstract: Structural failure of welded joints due to high residual stress is a common technical problem in welded structures. For ultrasonic impact treatment can effectively improve the mechanical properties of welded joints, it has been widely used in various fields. In this study, we focus on the research of ultrasonic impact technology in reducing residual stresses and improving fatigue properties of welded joints, as well as the latest related research and application of the ultrasonic impact technology with welding.