Structural damage caused by uplift will reduce the service life of the structure, even affect the overall safety of the structure, and it is of great significance to the analysis and treatment of floating accidents. Local floating accident was happened in an underground garage affected by rainstorm. In order to understand the influence of floating accident on garage structure, the basic situation of the accident site and relevant engineering data were investigated, the damage and deformation of structural members were checked. According to the field investigation results, the causes of the floating of the garage and the damage mechanism of the structural components in the garage were analyzed. Based on the inspection and analysis results, corresponding reinforcement measures were proposed for the floating and damaged components of the garage. The final treatment results showed that the reinforcement measures adopted in this paper can effectively ensure the normal use and safety of the garage. Through the analysis of the actual cases, the analysis and treatment methods of the floating accidents were briefly described, which can provide reference for similar projects.