Abstract: The project overview of underground 3-story deep excavation located at No.33 on the Bund source in Shanghai is introduced. According to its properties of large scale, complex surroundings, unfavorable geological conditions and urgent schedule, pre-protection measures are taken for the protective historic buildings and ancient trees. The top-down method and pipe roof method are applied when measures such as joint strengthening and temporary bracing are adopted. Excellent engineering effects are achieved. The analysis results of the monitoring data may provide reference for similar projects in future.