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Aim at the incomplete database of millimeter-wave dual-polarization radiation characteristics of typical ground objects, the 8 mm-band dual-polarization radiation characteristics of three typical ground objects in the sky, water surface, and vegetation land were studied, and the horizontal and vertical radiation were compared. Temperature, analyze their polarization. Based on the basic principle of millimeter-wave radiation measurement, an 8-mm dual-polarization radiometer and a calibration source are designed. Based on the millimeter-wave radiation characteristics of typical feature backgrounds, the 8-mm dual-channel radiometer is used to radiate three types of feature backgrounds. Characteristic data were collected, processed and analyzed; experiments explored the polarization effects of different ground objects backgrounds, enriched the radiation characteristics database, and provided effective data support for typical ground object imaging and target recognition.