Abstract: Cavitation phenomena occurring in the narrow flow channels of valves, bearings, and blade pumps can cause severe damage to structural surfaces. The present paper summarizes the research findings on bubble dynamics near different boundaries within narrow gaps, presents mathematical treatment methods for various boundaries, and introduces the Kelvin impulse theory model for predicting the bubble collapse behaviors. It showcases typical experimental phenomena of the bubble near different boundaries within the gap and reveals the mechanisms of the bubble movement based on theoretical results of the liquid velocity and the Kelvin impulse distribution. The results indicate that the Kelvin impulse theory can effectively predict the dynamic characteristics of the bubble, providing a theoretical foundation for the research of the bubble dynamics within narrow gaps.