There are not only fighter threats , but many threats, such as S!S tactics missile and cruise missile that have appeared in present battlefield . For these flight objects, its performance that the flight velocity, the flight space, the flight range, maneuver property, E/O!CCM characteristic and so on, have been improved explosively. So it is necessary to explore new missile homing technology to make the precise guidance ability of S !A missile system better. IR (IIR) seeker or RF/IR dual !mode integrated seeker possesses the potential advance ability . New development of dual!mode integrated homing weapon on abroad is introduced, besides the advantage and weakness of the IR detector techniques, which are applied in the dual!mode integrated homing guidance of S!A (A!A)missile system, are discussed in this paper.