Abstract: Deep excavation of Wenzhou Grand Theater was located in the deep silt layer,which was dug 10.55 m in depth.In the design of the protective structure of excavation,the characteristics of the engineering arrangement were well utilized.The soil-nailing wall was the main type of pit-protection structure,meanwhile,some compound types of proctection were adopted,such as soil-nailing with bracing soil-nailing with scattered piles and soil-nailing with rows of piles and struts.The largest displacement monitored in the field,was only 80 mm.Other monitored indexes were all within the standard limit of the design.The design idea and the structural characteristics of the excavation engineering were presented in detail in order to provide reference for the similar engineering projects.