Quantum radar is a kind of new system improving the detection performance by using quantum resource．It can break through the property limitation of traditional radar with promising application in many fields. There exists the contest of the stealth weapon in the future battlefields, which not only relate to the manned plane, the unmanned plane, but also cruise missile and trajectory missile, all develop to the stealth direction. It is very urgent to research the method to withstand these stealth targets for each country. The principal aim is to find them for beating and destroying. The system of air defense with the main characteristics of anti-stealth has become one of the most important aspects. As a result, it focuses the existing advanced stealth plane and the potential quantum radar with the combination of passive radar in passive system. The mechanism and the application research of target detection are studied for the above stealth target.