The integral shroud blades with contact-impact damping structure in tips have advantages of vibration reduction, convenient installation and low precision for manufacture. They have been successfully applied on stream turbines for safe operation over many years. But the researches on the damping mechanism and damping effect for such a structure are rather limited. Combined with researches on vibro-impact theory, the research status of integral shroud blades are summarized from the aspects such as the characteristic of vibro-impact, dynamic model, numerical method and experimental studies. Several key problems for future research are also presented.