The prestressed large-span sandwich laminated floor used as floor slab has many advantages: reducing self-weight, saving materials, formwork and bracing, good integrality, environmental protection and building industrialization.

For improving the interface's associative intensity of composite sandwich structure,we prepare a new composite sandwich with the compound core of composite pillar and foam plastic.

type piezoelectric composites using thickness shear mode (PCMTS) were selected as the cores of the sandwich structure, which can generate the thickness shear deformation and actuate the sandwich structure to give rise to the desired transverse deflection.

Microwave-absorbing composite sandwich structures have been widely used because of its light weight,high strength as well as perfect property of electromagnetic wave absorption.

The advances in phenolic foam and its sandwich panel in China and abroad,including its application development and marked situation in China and abroad,were reviewed with 9 refs and the production process of PF and its market needs or profit rate were also introduced in this paper.