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Aim at the measurement of radiant characteristics of aquatic vegetation which use a 3mm radiometer, base on the study of water’s brightness temperatures and aquatic vegetation’s radiant characteristics. The establishment of multilayer dielectric model about aquatic vegetation is based on coherent method. Compared to 3 layer dielectric model, this model’s result is in better accordance with the experimental data. this shows that the multilayer dielectric model can model aquatic vegetation’s radiant characteristics more precisely. The experiment shows that the aquatic vegetation’s brightness temperature is higher than water's in different incident angles. This result shows that water has millimeter wave radiant characteristics of low brightness temperature、cold target compared to aquatic vegetation, so the radiant characteristics can be used to monitor aquatic vegetation .