 abstract covalent organic frameworks, COFs are a type of crystalline porous organic material composed of strong covalent bonds between organic units. These materials have been used in combination with other materials such as metals or polymers to create composite materials with improved properties compared to their individual components. The development of these composite materials has been driven by advances in synthetic techniques and nanotechnology, allowing for the creation of materials with unique properties. This review provides an overview of the current state of research into COF-based composites, focusing particularly on their applications. Finally, we discuss the challenges and opportunities for future developments in this field. This article was authored by Jia Chen, using Wang, Yongliangu, and others.