Abstract: There has been extensive development in the study of cloaking technology since the discovery of metamaterials. Different from "stealth" technology used for military purposes, cloaking refers to a total annihilation of the scattering of electromagnetic waves in all directions, and thus achieving invisibility as depicted in mythology and sci-fiction. Because of its scientific importance and the possible dramatic impact on technology, cloaking has become a hot research topic. Moreover, illusion optics has also been demonstrated by means of which scientists can make an object "look like" anything else. The development of cloaking and illusion optics could turn human imagination to reality in the future. Some of our works in cloaking and illusion optics are reviewed here.