Abstract:Based on the statistical data of Reconnaissance platform for ground targets and its performance parameters,analyzed of the characteristics of space and aviation reconnaissance threats,summed up the exposure of the ground target. established the threat weight assessment model of Reconnaissance Threat for Ground Targets by the method of AHP,determined the analysis methods of various influencing factors, the calculated threat weights of radar, infrared and Optical for ground targets are 25%,14% and 61%,respectively.A new analysis method for more accurate threat object detection is put forward,its is important for the stealth design and stealth efficiency Assessment.