The sandwich panel with a folded core is a new type one and has promising futures for the application in flight vehicles.

Based on the transmission line theory,the shield efficiency calculate formula of folder-filler formed by metal silk screen is established.

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.