Hollow floor itself has a certain porosity (generally 35% ~ 50%), which is very beneficial to earthquake resistance. The thickness of this kind of floor is larger than that of the general solid flat plate, and its in-plane and out-of-plane stiffness is greater, and the lateral stiffness of the whole building is improved a lot. The building engineering of cast-in-place concrete hollow floor generally has good seismic performance. The cast-in-place concrete hollow floor adopts "equivalent frame method" to analyze the structure with vertical members and bearings. Cast-in-place concrete hollow floor makes full use of the excellent performance of hollow slab structure, which can effectively reduce the height of the structure, greatly reduce the weight of the structure and improve the comprehensive performance of the building structure. It is a new environmental protection and energy-saving product, which conforms to the industrial ecological law and the development direction of circular economy. In the past ten years, this technology has been widely used in China, and the scale and number of projects are increasing day by day. The concrete floor is mainly a flexural member, and the tension and pressure are concentrated on the upper and lower sides of the section to form a bending moment; The middle section has little effect on resistance. Concrete is arranged in the compression area, steel bars are arranged in the tension area, and a layer of concrete is wrapped enough to anchor and coordinate the stress, while the bending bearing capacity of concrete in the middle area is basically unaffected, resulting in I-shaped and T-shaped? Hollow sections such as shapes and boxes can generally save concrete? 30%~60%。 These cross-sectional forms of stressed members optimized for saving concrete can greatly reduce the amount of concrete without basically affecting the bearing capacity, which not only has economic effects, but also has obvious effects on reducing the self-weight of the structure and alleviating the earthquake effect. Superstar Company has done nearly 300 hollow floor projects in Chengdu, Dujiangyan and Deyang. In the Wenchuan earthquake, there was no damage or collapse except some small cracks on the floor surface.