Abstract: With the development of stealth technology, military targets are faced with tremendous threatens, thus counte- measures against stealth technology become a pressing task and requirement. In this paper, the basic theory of stealth technology and its limitations are presented briefly, starting from those limitations, radar countermeasures against stealth technology are introduced. It also introduces some kinds of radars with anti-stealth Technology, such as arrayed radar, laser radar, multi-static radar, synthetic aperture radar, and so on.