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Aim at solving the problem of the imperfect database of millimeter-wave radiation characteristics of regular metal stereoscopic targets, the radiation characteristics of three typical targets, such as metal spheres, metal columns and metal cubes, were studied. The effects of different structures on the MMW radiation characteristics of targets were compared and analyzed. The temperature contrast of the metal plane target antenna is calculated theoretically, and the apparent temperature of the surface of the metal stereo target within the main beam range of the antenna is deduced using the face element method. Based on this, using radiometers to make actual measurements of different metallic stereo targets, the causes of apparent temperature differences were analyzed. The experiment enriches the millimeter-wave radiation characteristics database of metallic stereo targets, providing accurate and effective data support for typical metal stereoscopic target imaging and target recognition.