Abstract: Deep excavation of Shenzhen galaxy hotel is in complex surrounding environments, and the depth is 18. 6m. Because the diversity of surrounding environments, some compound types of protection are adopted in the design of the protective structure of excavation, the main type are secant piles and artificially excavating holed secant piles, meanwhile, piles and anchors supporting, anchoring wall are adopted. Static blasting and cutting technique are adopted in dismantling the inner support. Other monitored indexes are all within the standard limit of the design. The characteristics of pit displacement and the reason of horizontal displacement occurs are analyzed. It can be a reference for the similar engineering projects.