The menace can appear in each direction in modem war,and this urge that super wide angle imaging system appear.But in this kind system,the field angle is too big for the system and the staring FOV is big for each pixel of FPA.Base in this,great mass of military target will imaging as sub-pixel target on FPA in this kind system.A moving target will appears as with up-and- down gray scale in sequence images of this super wide angle imaging system for it′s sub-pixel imaging attribute.And this make that the moving target will much more like noise in many attributes such as geometrical shape,stability of gray scale and time continuity.For the imaging relation of super wide angle lens should be brought in barrel distortion unavoidably,and this make that the move track of target will appears as curve in the system.The premise,that move target with line track and as the base for much dim target detection method,will disappear.At the same time,for this kind system with super wide FOV,the influence of sky background will come to the fore for that thermal radiation of air show different value under different elevation.Summarize such special problems of dim target detection under super wide angle imaging system.It is helpful for research appropriate and special target detection method for this kind system.