This paper reviews the overall research and development of thermal metametraials in terms of thermal conduction, convection and radiation in 2018. We summarize in particular seven research topics, which are (1) efficient manipulation of thermal conduction by using structured surfaces, (2) theoretical establishment and application exploration of inhomogeneous thermal structure, (3) thermal cloak with thermal near-zero-index-materials, (4) establishment of transformation thermal convection theory, (5) abnormal phenomena of thermal convection, (6) thermal radiation:energy collection from the sun and the outer space, and (7) application design and integration development of thermal metamaterials. All these topics are related not only to fundamental research but also to application development.

transformation thermotics  /  thermal device  /  conduction  /  convection  /  radiation