Abstract: Taking the airborne platform as the research object, firstly based on analyzing the principle of the photoelectric reconnaissance system to achieve the target geo-location, the main factors affecting the target geo-location accuracy of the photoelectric reconnaissance system are obtained: the electro-optical reconnaissance system position-error, azimuth-error, attitude-error and the distance from system to target, etc. Secondly the target geo-locating error model for electro-optical reconnaissance system are educed. Analysis and emulation for the relationship among target geo-locating accuracy and azimuth-error, attitude-error indicate that azimuth-error, pitch-error of electro-optical reconnaissance system are the uppermost factors which affect the target geo-locating accuracy, and it is reasonable for the inertial navigation that the azimuth-error is oontrolled in 0.02°~0.5°, the attitude-error is controlled in 0.01°~0.25°. Finally, some suggestions to improve the target geolocation accuracy are put forward.