The YK Pao Library is currently being renovated as a remodeling project, with all aspects of the civil engineering work, including the ceiling, floors, and walls, having been completed not long ago. The design is based on the overall renovation of the original decoration of the Bao Yugang Library, in which the biggest difficulty lies in not destroying the original civil construction and decoration of the finished surface under the premise of maximizing the use of prefabricated components to achieve the design effect of the overall renovation of the intervention type of renewal, so we use modularity in the design to achieve the design of each layer of the design in advance to complete the modular prefabrication in the factory, and then moved to the site for construction work. The design of each floor is modularized and prefabricated in advance in the factory, and then moved to the site for construction work.