The GeoEye satellite system, the next generation electro-optic system, the STSS and the Tacsat system in American Space-based Electro-optic Reconnaissance System are studied. The mainly technology indexes and operation characteristics of high resolution, full color, multi-spectrum cameras, advanced wide FOV acquisition sensors, staring multi-band tracking sensors for narrow FOV are analyzed. The large diffraction film optic system, the advanced optic camera system, optic sensors, infrared detectors, visible light imagers and infrared imagers are briefly introduced in future development plans.